Which HTTP method is used to send data to the server?

The POST method is specifically designed for sending data to the server. When a client uses the POST method, it transmits data in the body of the request, often to create a new resource or to submit data for processing. This is a crucial function in web development where interactions such as forms or data submissions occur.

In contrast, the GET method retrieves data from the server but does not send data in the body of the request; it appends data to the URL. The DELETE method is used to remove resources from the server and does not focus on sending data. The PUT method is primarily for updating existing resources, although it can send data to create a resource at a specific URL—however, its main intent is to modify rather than just send. Thus, POST clearly fulfills the requirement to send data to the server effectively.