OSI (Operating System Interface) model :
1. OSI model has seven layers.
2. It has provides clear distinction between services, interfaces and protocols.
3. In OSI model transport layer is connection oriented.
TCP/IP (Transfer Control Protocol / Internet Protocol ) model :
1. TCP/IP has four layers.
2. It doesn't provide clearly distinguish between services, interfaces, and protocols.
3. In TCP/IP transport layer is both connection oriented and connectionless.