What does the HTTP PUT method do?

The HTTP PUT method is used to replace all current representations of the target resource with the request payload. If the target resource does not exist, PUT can create it. This makes it an idempotent operation, meaning that multiple identical requests will have the same effect as a single request (it will always result in the same resource state). Therefore, "Replaces resource data at the destination" is correct. "Is a nonidempotent operation" is incorrect because PUT is idempotent. "Is a read-only operation" is incorrect; PUT modifies data, making it a write operation. "Renders a website" is incorrect; rendering a website is typically handled by a web browser after receiving content via methods like GET.