why is express used with nodejs code example

Example 1: express js

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.

Example 2: express js

Express is a minimal and flexible Node.js web application framework
that provides a robust set of features for web and mobile
applications.