What is the primary function of the Internet Service Provider (ISP)?

The primary function of an Internet Service Provider (ISP) is to provide individuals and organizations with access to the Internet. ISPs facilitate the connection between users and the broader network that comprises the Internet. They offer various services, including broadband or dial-up Internet access, leased lines, and sometimes additional services such as email and web hosting. This connectivity allows users to communicate, share information, and access online resources.

The other options describe different concepts within the realm of networking and computing. They include protocols for file transfer, identifiers for devices on a network, and programming languages used for creating web content, none of which encapsulate the primary role of an ISP. An ISP focuses specifically on connecting users to the Internet and enabling them to utilize online resources effectively.