What action does the @HttpPost annotation perform?

The @HttpPost annotation is utilized in Salesforce to handle HTTP POST requests, which are typically used to create new resources on the server. Therefore, when this annotation is applied to a method within an Apex class, it signifies that the method is intended to process the incoming data from the client, resulting in the creation of new records in Salesforce.

In web services, the POST method is conventionally used to submit data to a specified resource, where the server processes the request and often creates a new entry in the database or collection. This aligns with how the @HttpPost annotation is configured in Salesforce—indicating that it handles the creation of records as a primary function.

Additionally, the options that involve reading, updating, or deleting records correspond to the GET, PATCH, and DELETE methods, respectively, which are not associated with the @HttpPost annotation. Each of those methods has distinct functionalities that do not overlap with the purpose of @HttpPost. Therefore, the action performed by @HttpPost is unequivocally linked to the creation of records.