Ajax, on the other hand, is used when there is a need for dynamic web pages that require smooth user interaction without reloading the page. It is commonly used when sending requests to the server, such as form submissions and sending data in real-time applications like chat applications and real-time stock updates. Ajax comes in handy when you only need to update a small portion of the web page rather than the entire page.
Ajax offers several benefits for web applications, making it a popular choice among developers. Ajax allows web pages to communicate with the server in the background. This means that you can get data from the server without refreshing the entire page hence improving user experience. It reduces bandwidth usage, as only the required data is sent to the server, instead of the entire page, which makes the web page load faster. Additionally, users can interact with the web page without leaving the current page.