diff --git a/semana18/heranca-polimorfismo/.gitignore b/semana18/heranca-polimorfismo/.gitignore
new file mode 100644
index 0000000..dd87e2d
--- /dev/null
+++ b/semana18/heranca-polimorfismo/.gitignore
@@ -0,0 +1,2 @@
+node_modules
+build
diff --git a/semana18/heranca-polimorfismo/exercicios-aula53.md b/semana18/heranca-polimorfismo/exercicios-aula53.md
new file mode 100644
index 0000000..e04e705
--- /dev/null
+++ b/semana18/heranca-polimorfismo/exercicios-aula53.md
@@ -0,0 +1,58 @@
+### HERANÇA
+
+
Exercício 1
+
+A: Sim e Não. Se eu chamar a nova instância toda, eu consigo. Caso queira chamar só a senha, não seria possível, porque o atributo é privada e não há método para acessá-la de fora da classe.
+
+B: Apenas uma vez.
+
+Exercício 2
+
+A: Apenas uma vez.
+
+B: Duas vezes. A primeira vez foi iniciada com referência ao Cliente e depois mais uma vez, pois o Cliente herdou informações do Usuário.
+
+Exercício 3
+
+A: Sim. Ao imprimir a instância inteira, os atributos privados também serão mostrados.
+
+
+
+### POLIMORFISMO
+
+Exercício 1
+
+A: Imprimir todas, não, porque as propriedades estão como informações publica. No entretanto, a função calculateBill não apresentou o valor retornado, e sim uma mensagem "[Function: calculateBill]".
+
+Exercício 2
+
+A: Cannot create an instance of an abstract class.
+
+B: Pense e responda: o que precisaríamos fazer para conseguir efetivamente criar uma instância dessa classe?
+Para criar uma instância de uma classe abstrata precisamos declarar uma classe filha e criar uma instância dessa última.
+
+Exercício 3
+
+A: Para criar uma instância de uma classe abstrata precisamos declarar uma classe filha e criar uma instância dessa última.
+
+B: Place é uma classe porque precisa ter um acesso restrito a um dos seus atributos, o que é impossível de se fazer em interfaces.
+
+C: Place é abstrata porque não enxergamos uma situação em que seria necessário criar uma instância dessa classe.
+
+Exercício 4
+
+A: Possui os métodos getCpf e calculateBill, e as propriedades "name", "registrationNumber", "consumedEnergy", "cpf", "residentsQuantity" e "cep". Porque ela herdou da classe Residence, Place e da interface Client.
+
+Exercício 5
+
+A:. Herda todos os métodos e atributos da classe Commerce e Place, assim como a interface Client.
+
+B: A diferença é que cada classe tem um atributo original privado, como no caso CPF e CNPJ.
+
+Exercício 6
+
+A: Ela é filha da Industry, porque precisa herdar todos os atributos dela.
+
+B: Ela implementa o Client, porque é uma interface própria para pegar todas os atributos do cliente.
+
+C: Porque não há nenhuma propriedade da classe que deva ser alterada.
\ No newline at end of file
diff --git a/semana18/heranca-polimorfismo/package-lock.json b/semana18/heranca-polimorfismo/package-lock.json
new file mode 100644
index 0000000..7f40194
--- /dev/null
+++ b/semana18/heranca-polimorfismo/package-lock.json
@@ -0,0 +1,1127 @@
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diff --git a/semana18/heranca-polimorfismo/package.json b/semana18/heranca-polimorfismo/package.json
new file mode 100644
index 0000000..bfd7968
--- /dev/null
+++ b/semana18/heranca-polimorfismo/package.json
@@ -0,0 +1,29 @@
+{
+ "name": "heranca-polimorfismo",
+ "version": "1.0.0",
+ "description": "",
+ "main": "index.js",
+ "scripts": {
+ "dev": "ts-node-dev ./src/index.ts",
+ "start": "tsc && node ./build/index.js",
+ "test": "echo \"Error: no test specified\" && exit 1"
+ },
+ "keywords": [],
+ "author": "",
+ "license": "ISC",
+ "dependencies": {
+ "cors": "^2.8.5",
+ "dotenv": "^14.2.0",
+ "express": "^4.17.2",
+ "knex": "^1.0.1",
+ "mysql": "^2.18.1"
+ },
+ "devDependencies": {
+ "@types/cors": "^2.8.12",
+ "@types/express": "^4.17.13",
+ "@types/knex": "^0.16.1",
+ "@types/node": "^17.0.10",
+ "ts-node-dev": "^1.1.8",
+ "typescript": "^4.5.4"
+ }
+}
\ No newline at end of file
diff --git a/semana18/heranca-polimorfismo/src/app.ts b/semana18/heranca-polimorfismo/src/app.ts
new file mode 100644
index 0000000..2785d8f
--- /dev/null
+++ b/semana18/heranca-polimorfismo/src/app.ts
@@ -0,0 +1,17 @@
+import express from "express"
+import cors from "cors"
+import { AddressInfo } from "net"
+
+export const app = express()
+
+app.use(express.json())
+app.use(cors())
+
+const server = app.listen(process.env.PORT || 3003, () => {
+ if (server) {
+ const address = server.address() as AddressInfo
+ console.log(`Server is running in http://localhost:${address.port}`)
+ } else {
+ console.error(`Failure upon starting server.`)
+ }
+})
\ No newline at end of file
diff --git a/semana18/heranca-polimorfismo/src/index.ts b/semana18/heranca-polimorfismo/src/index.ts
new file mode 100644
index 0000000..602d0db
--- /dev/null
+++ b/semana18/heranca-polimorfismo/src/index.ts
@@ -0,0 +1,71 @@
+import { Client, Commerce, CommercialClient, Customer, IndustrialClient, Industry, Place, Residence, ResidentialClient, User } from "./types"
+
+//HERANÇA
+
+//EXERCICIO 1 - HERANÇA
+
+const newUser: User = new User ("1", "luiz@gmail.com", "Luiz", "123321")
+
+console.log({id: newUser.getId(), name: newUser.getName(), email: newUser.getEmail()})
+
+// //EXERCICIO 2 - HERANÇA
+
+const newCustomer: Customer = new Customer ("2", "ricardo@gmail.com", "Ricardo", "456456", "Visa")
+
+console.log(newCustomer)
+
+// //EXERCICIO 4 - HERANÇA
+
+console.log(newCustomer.introduceYourself())
+
+// //POLIMORFISMO
+
+// //EXERCICIO 1 - POLIMORFISMO
+
+const newClient: Client = {
+ name: "Mari",
+ registrationNumber: 1,
+ consumedEnergy: 100,
+ calculateBill: () => {
+ return 2
+ }
+}
+
+console.log(newClient)
+
+// //EXERCICIO 2 - POLIMORFISMO
+
+/*const newPlace: Place = new Place ("01234567")
+
+console.log(newPlace)*/
+
+// //EXERCICIO 3 - POLIMORFISMO
+
+const newResidence: Residence = new Residence(3, "12345678")
+
+const newCommerce: Commerce = new Commerce(5, "87654321")
+
+const newIndustry: Industry = new Industry(7, "02466420")
+
+console.log({residenceCEP: newResidence.getCep(),commerceCEP: newCommerce.getCep(),industryCEP: newIndustry.getCep()})
+
+//EXERCICIO 4 - POLIMORFISMO
+
+const newResidentialClient: ResidentialClient = new ResidentialClient ("Clara", 1, 10, "333.555.777-99", 2, "12345678")
+
+console.log(newResidentialClient)
+console.log(newResidentialClient.calculateBill())
+
+//EXERCICIO 5 - POLIMORFISMO
+
+const newCommercialClient: CommercialClient = new CommercialClient ("Doces Illes", 2, 10, "11.222.444/0001-66", 1, "87654321")
+
+console.log(newCommercialClient)
+console.log(newCommercialClient.calculateBill())
+
+//EXERCICIO 6 - POLIMORFISMO
+
+const newIndustrialClient: IndustrialClient = new IndustrialClient ("Illes S/A", 3, 10, 2022/2021, 4, "02461357")
+
+console.log(newIndustrialClient)
+console.log(newIndustrialClient.calculateBill())
\ No newline at end of file
diff --git a/semana18/heranca-polimorfismo/src/types.ts b/semana18/heranca-polimorfismo/src/types.ts
new file mode 100644
index 0000000..ba38b58
--- /dev/null
+++ b/semana18/heranca-polimorfismo/src/types.ts
@@ -0,0 +1,177 @@
+//HERANÇA
+
+export class User {
+ private id: string
+ private email: string
+ private name: string
+ private password: string
+
+ constructor(
+ id: string,
+ email: string,
+ name: string,
+ password: string
+ ) {
+ console.log("Chamando o construtor da classe User")
+ this.id = id
+ this.email = email
+ this.name = name
+ this.password = password
+ }
+
+ public getId(): string {
+ return this.id
+ }
+
+ public getEmail(): string {
+ return this.email
+ }
+
+ public getName(): string {
+ return this.name
+ }
+
+ public introduceYourself(): string {
+ return `Olá, sou ${this.name}. Bom dia!`
+ }
+}
+
+export class Customer extends User {
+ public purchaseTotal: number = 0
+ private creditCard: string
+
+ constructor(
+ id: string,
+ email: string,
+ name: string,
+ password: string,
+ creditCard: string
+ ) {
+ super(id, email, name, password)
+ console.log("Chamando o construtor da classe Customer")
+ this.creditCard = creditCard
+ }
+
+ public getCreditCard(): string {
+ return this.creditCard
+ }
+}
+
+//POLIMORFISMO
+
+export interface Client {
+ name: string
+ registrationNumber: number
+ consumedEnergy: number
+ calculateBill(): number
+}
+
+export abstract class Place {
+ constructor(protected cep: string) {}
+
+ public getCep(): string {
+ return this.cep
+ }
+}
+
+export class Residence extends Place {
+ constructor(
+ protected residentsQuantity: number,
+ cep: string
+ ) {
+ super(cep)
+ }
+
+ public getResidentsQuantity(): number {
+ return this.residentsQuantity
+ }
+}
+
+export class Commerce extends Place {
+ constructor(
+ protected floorsQuantity: number,
+ cep: string
+ ) {
+ super(cep)
+ }
+
+ public getFloorsQuantity(): number {
+ return this.floorsQuantity
+ }
+}
+
+export class Industry extends Place {
+ constructor(
+ protected machinesQuantity: number,
+ cep: string
+ ) {
+ super(cep)
+ }
+
+ public getMachinesQuantity(): number {
+ return this.machinesQuantity
+ }
+}
+
+export class ResidentialClient extends Residence implements Client {
+ constructor(
+ public name: string,
+ public registrationNumber: number,
+ public consumedEnergy: number,
+ private cpf: string,
+ residentsQuantity: number,
+ cep: string
+ ) {
+ super(residentsQuantity, cep)
+ }
+
+ public getCpf(): string {
+ return this.cpf
+ }
+
+ public calculateBill(): number {
+ return this.consumedEnergy * 0.75
+ }
+}
+
+export class CommercialClient extends Commerce implements Client {
+ constructor(
+ public name: string,
+ public registrationNumber: number,
+ public consumedEnergy: number,
+ private cnpj: string,
+ floorsQuantity: number,
+ cep: string
+ ) {
+ super(floorsQuantity, cep)
+ }
+
+ public calculateBill(): number {
+ return this.consumedEnergy * 0.53
+ }
+
+ public getCnpj(): string {
+ return this.cnpj
+ }
+}
+
+export class IndustrialClient extends Industry implements Client {
+ constructor(
+ public name: string,
+ public registrationNumber: number,
+ public consumedEnergy: number,
+ private insdustryNumber: number,
+ machinesQuantity: number,
+ cep: string
+ ) {
+ super(machinesQuantity, cep)
+ }
+
+ public getInsdustryNumber(): number {
+ return this.insdustryNumber
+ }
+
+ public calculateBill(): number {
+ return this.consumedEnergy * 0.45 + this.machinesQuantity * 100
+ }
+}
\ No newline at end of file
diff --git a/semana18/heranca-polimorfismo/tsconfig.json b/semana18/heranca-polimorfismo/tsconfig.json
new file mode 100644
index 0000000..00410ae
--- /dev/null
+++ b/semana18/heranca-polimorfismo/tsconfig.json
@@ -0,0 +1,12 @@
+{
+ "compilerOptions": {
+ "target": "es6" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */,
+ "module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */,
+ "outDir": "./build" /* Redirect output structure to the directory. */,
+ "rootDir": "./src" /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */,
+ "strict": true /* Enable all strict type-checking options. */,
+ "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */,
+ "forceConsistentCasingInFileNames": true /* Disallow inconsistently-cased references to the same file. */,
+ "resolveJsonModule": true
+ }
+}
\ No newline at end of file