Which method type is primarily used for sending data to a server in an HTTP call?

The POST method is primarily used for sending data to a server in an HTTP call. This method allows clients to submit data to a server, which can then process the information accordingly. It is commonly used when creating new resources or submitting forms, as it encapsulates the data in the body of the request, enabling the transmission of complex data types such as JSON.

When using POST, the data sent can encompass various formats and structures, making it suitable for various applications. Additionally, POST requests can result in changes in server state or side effects on the server, such as creating new records in a database.

The other methods have different primary functions. For example, the GET method is designed primarily for retrieving data from a server rather than submitting it. The DELETE method is used to delete resources on a server, while the PATCH method is intended for making partial updates to existing resources. Given these distinctions, POST is the correct choice for the purpose of sending data to a server.