What is the purpose of an IP address?

An IP address serves as a unique identifier for each device connected to a network, including the internet. It functions similarly to a postal address, allowing data to be sent and received accurately between devices. Every device that connects to the internet or any other network needs a distinct IP address to differentiate itself from others. This address enables routers and other networking equipment to route information effectively, ensuring that data packets reach the correct destination.

The other options presented do not align with the primary function of an IP address. While they each play a role in internet functionality, they do not fulfill the unique identification role that an IP address does. For instance, displaying website content is primarily the job of web servers and browsers, while storing user preferences is managed through cookies and local storage mechanisms. Network security settings are managed through a variety of configurations and firewalls rather than through IP addressing.