what is express() in express code example

Example 1: express

npm install express
npm install express --save
Docs : https://expressjs.com/
- Example API : https://jareer.xyz/ -

Example 2: express

Express.js, or simply Express, is a web application framework for Node.js,
released as free and open-source software under the MIT License.

It is designed for building web applications and APIs.
It has been called the de facto standard server framework for Node.js.