Networks and Web technologies

Both models are built on layers, but the TCP/IP^[1] model merges some of the functionalities of multiple OSI^[1] layers into fewer, more practical layers: Network Access (Physical + Data Link), Internet (OSI^[1] Network), Transport (OSI^[1] Transport), and Application (OSI^[1] Session + Presentation + Application).

TCP/IP model is practical and widely implemented, whereas OSI remains mostly theoretical.