What is a Web Application?

A web application is a program that can be accessed through a web browser and runs on a web server. Modern web applications do not require installation and can be accessed from any device with an internet connection. Some examples of where they are most commonly used are e-commerce, social networking, and online collaboration. 

Web applications consist of a front-end user interface and a back-end server that handles data processing and storage. Although web apps have many advantages, they require careful attention to security, as they are often targeted by cyber attacks. Developers must follow best practices for web app development and implement robust security measures to ensure their reliability and security.