What Is Transmission Control Protocol (TCP)? Definition From ...

What TCP is used for?

TCP is used for organizing data in a way that ensures secure transmission between the server and the client. It guarantees the integrity of data sent over the network, regardless of the amount. For this reason, it is used to transmit data from other higher-level protocols that require all transmitted data to arrive.

Examples of these protocols include the following:

• Secure Shell, FTP, Telnet. For P2P file sharing, and, in Telnet's case, logging into another user's computer to access a file.
• SMTP, Post Office Protocol, Internet Message Access Protocol. For sending and receiving email messages.
• HTTP. For web access.

These examples all exist at the application layer of the TCP/IP stack and send data downwards to TCP on the transport layer.

Some important use cases of TCP include the following:

• Reliable transfer of data. One of the main functions of TCP is to ensure reliable data delivery by providing error detection, packet re-transmission and sequencing of data packets. It guarantees that data is received error-free and in the correct order.
• Web browsing. Without TCP, web browsing wouldn't be possible. TCP establishes a network connection between the client, which is the web browser and the server hosting the website. It guarantees that resources and web pages are supplied consistently and in the right order.
• Email delivery. TCP is also used for email delivery. By establishing a connection between the client and the email server, TCP guarantees that emails are delivered and received reliably.
• File transfer. TCP is often used for file transfer protocols, such as FTP and Secure File Transfer Protocol. It ensures that files are transported reliably and without errors.
• Remote access. TCP is also used for remote access with protocols including Telnet and SSH. These protocols enable users to access and control computers or network devices remotely through a secure connection.
• Database access. TCP is used for accessing databases over networks. It guarantees the secure and dependable transmission of queries and database responses.
• Messaging and chat. TCP is employed in messaging and chat applications to guarantee the dependable delivery of messages among users.
• Virtual private networks. TCP is utilized within VPNs to create secure and dependable connections linking remote users with private networks.