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Sure, I can help you understand these codes. They are written in JavaScript, a programming language that can run on both the browser and the server. These codes are part of a web application that uses Express.js, a framework that simplifies Node.js web server APIs and adds new features¹²³.

Let me explain each line of code with an easy example in the real world:

• const express = require('express');
  • This line imports the express module, which is a package of code that provides various functions and features for web development. You can think of it as a toolbox that contains many tools for building websites. To use the express module, you need to install it using a command like npm install express in your terminal. Then, you can use the require function to load the module and assign it to a constant variable called express. This is like opening the toolbox and getting ready to use the tools inside.
• const router = express.Router();
  • This line creates a new router object, which is a tool that helps you organize your web application into smaller and modular chunks. You can think of it as a map that shows you how to get from one page to another in your website. The router object is created by calling the Router method of the express module. This is like drawing a map and labeling the routes with names and directions..