Synchronous vs. Asynchronous. In the context of the XmlHttpRequest object, when you use Synchronousrequests, the request is carried out in line with the process that called it, and everything waits on it to complete. Asynchronous requests, however, once submitted, don't wait on a response. A listener is set up to listen for the response, but the execution of the code doesn't stop and wait for it.
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