The ability to track the number of online users in a web application is crucial for understanding user engagement, optimizing server performance, and even for security purposes. Whether you’re running a small blog or managing a large-scale platform, knowing how many users are active at any given time can offer valuable insights. In this article, we’ll dive deep into various methods you can use to count online users in your application, offering code examples, explanations, and demos to help you implement this functionality efficiently.