TCP/IP (Transmission Control Protocol/Internet Protocol) is a suite of protocols used for communication over the Internet.
TCP/IP is not an exact match to the OSI model, but it can be loosely mapped to the OSI layers as follows:
Network interface layer (equivalent to the Physical and Data Link layers)
Internet layer (equivalent to the Network layer)
Transport layer (equivalent to the Transport layer)
Application layer (equivalent to the Session, Presentation, and Application layers)