3: Describes the function of protocols in the transfer of data, with reference to a specific web protocol. 2: Describes the function OR provides an example of a web protocol and its use. 1: Some relevant information.

Protocols are important in data transfer as they establish rules for communication between devices connected to a network, such as the internet. HTTP (Hypertext Transfer Protocol) enables browsers to request web content from servers, which respond with the requested data. The protocol defines the structure of requests and the response so that data transfer can occur.