Wikipedia
In computer networking, the transport layer is a conceptual division of methods in the layered architecture of protocols in the network stack in the Internet protocol suite and the OSI model The protocols of this layer provide host-to-host communication services for applications It provides services such as connection-oriented communication, reliability, flow control, and multiplexing The details of implementation and semantics of the transport layer of the Internet protocol suite, which is the foundation of the Internet, and the OSI model of general networking are different The protocols in use today in this layer for the Internet all originated in the development of TCP/IP
Transport layer - Wikipedia, the free encyclopedia