In the case of REST APIs, both PUT and POST methods are used for sending data to the server. PUT is responsible for updating an existing resource or replacing it; hence, it is idempotent-the result is the same whether executed once or multiple times. POST would create a new resource and is non-idempotent; repetitions of request may result in the creation of multiple resources.

PUT: Updates a resource at a specific URI. Idempotent—sending the same request multiple times results in the same outcome.eg-PUT api/users/123 {"name": "Jane Doe","email": "[email protected]" } here we are updating user with id =123.POST: Creates a new resource, usually without specifying the URI (the server decides). Non-idempotent—multiple requests can create multiple resources. eg-> POST api/users {"name": "Jane Doe","email": "[email protected]" } Here we will create a new user (resource ) in server and return the status 201.