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IP: network layer protocol

TCP and UDP: transport layer protocols

HTTP: application layer protocol

API of the SOCKET:TCP/IP network.

TCP/IP stands for Transmission Control Protocol / Internet Protocol, which refers to a series of protocols.

TCP and UDP use the IP protocol to transport packets from one network to another. Think of IP as a highway that allows other protocols to drive on it and find exits to other computers. TCP and UDP are "trucks" on the highway, carrying goods such as HTTP, File transfer Protocol (FTP) and so on.

TCP and UDP are transport layer protocols used by things like FTP,HTTP and SMTP. Although both TCP and UDP are used to transmit other protocols, they have one significant difference: TCP provides guaranteed data transfer, while UDP does not. This means that TCP has a special mechanism to ensure that data is passed safely from one endpoint to another without error, and UDP does not provide any such guarantee.

HTTP (Hypertext transfer Protocol) is a protocol that uses TCP to transfer information between two computers (usually a Web server and a client). The client uses a Web browser to initiate a HTTP request to the Web server, and the Web server sends the requested information to the client.

Remember, you need the IP protocol to connect to the network; TCP is a mechanism that allows us to transfer data securely, and HTTP, which uses the TCP protocol to transfer data, is a special protocol used by Web servers and clients.

Socket interface is the API,Socket interface of TCP/IP network, which defines many functions or routines for developing applications on TCP/IP network.

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