Difference between Synchronous and Asynchronous Ajax Requests

Synchronous Ajax requests block the user interface until the request is complete, while asynchronous Ajax requests allow the user interface to remain responsive during the request.

Use synchronous requests when you want to make sure that certain actions are completed in a specific order. Use asynchronous requests when you want to improve the user experience by allowing the user to continue interacting with the website while requests are being processed in the background.