What is TCP/IP stack?

The TCP/IP stack is a suite of communication protocols used to interconnect network devices on the internet. It provides end-to-end data communication specifying how data should be packetized, addressed, transmitted, routed, and received. It is commonly used as the primary protocol suite for networks ranging from local area networks (LANs) to wide area networks (WANs), including the Internet. It's a foundational technology for almost all internet applications.