TCP/IP & OSI

TCP/IP stands for Transmission Control Protocol/Internet Protocol.

The application layer: 

communicate directly with the end-users.

HTTP (Hypertext Transfer Protocol), 

FTP (File Transfer Protocol), 

SMTP (Simple Mail Transfer Protocol), and the

 DHCP (Dynamic Host Configuration Protocol).

The transport layer:  transmission of the correct message or data in proper order.

UDP (User Datagram Protocol) and TCP.