Expressjs is a web application framework used to develop web applications and APIs. It is a lightweight and efficient technology built on top of Node.js and is one of the most popular frameworks used for web development today. Expressjs is used to create powerful and dynamic web applications and APIs, and is perfect for creating applications that require real-time communication, such as chat and live streaming applications. It can also be used to create mobile applications, as the framework is able to run on both iOS and Android devices.
Expressjs is easy to use and provides many features that make web development simpler. It has a powerful routing system that makes it easy to create URLs and endpoints, as well as a built-in template engine for creating dynamic webpages. Expressjs also supports database integration, making it easy to store and retrieve data from databases.
Expressjs is also very flexible, as it can be used with a variety of other web technologies. It can be used with popular front-end frameworks such as Angularjs and React, as well as back-end technologies such as MongoDB, Cassandra, and CouchDB. This makes it an ideal choice for creating modern web applications and APIs.