ISP is an acronym of

ISP stands for Internet Service Provider, a company that gives users access to the internet.

Internal Service Provider is not the correct expansion of ISP.

Internet Service Procedure misreads the last word, which is provider, not procedure.

Instant Service Protocol is unrelated to what ISP denotes.

An ISP typically supplies a connection, an IP address and often email service.

Examples of ISPs include telecom and broadband companies that sell internet plans.