Yes, "Internet" does have a full form: Interconnected Network.
The Internet is a global network system that connects millions of computers and other electronic devices. This connection allows for the sharing of information and resources worldwide. It essentially functions as a vast collection of interconnected networks, encompassing websites, servers, and other online infrastructure.
The full meaning, Interconnected Network, highlights its core function: the ability to link diverse networks together to form a cohesive, global communication system.