A web application is a software application that runs on a web server and can be accessed through a web browser over the internet. Unlike traditional desktop applications, web apps do not require installation on the user's device, making them accessible from anywhere with an internet connection. Web applications can range from simple websites to complex platforms offering a wide array of functionalities, such as online banking, social media, e-commerce, and project management tools. They are built using technologies like HTML, CSS, JavaScript, and back-end frameworks such as Node.js, Django, or Ruby on Rails. The development process involves designing a user-friendly interface, ensuring cross-browser compatibility, and implementing robust security measures to protect user data. Web applications also benefit from regular updates and maintenance, which can be deployed quickly and seamlessly across all users. With their versatility and accessibility, web applications play a crucial role in modern digital ecosystems, providing dynamic and interactive experiences for users.