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The main difference between TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) lies in how they transfer data between devices over the internet.
1. Reliability: TCP is a connection-oriented protocol, ensuring that data packets are delivered accurately and in order. It establishes a connection before transmitting data and ensures that all packets are received and in the correct order. If packets are lost or arrive out of order, TCP will retransmit them and ensure they are correctly ordered, making it reliable. UDP, on the other hand, is connectionless and does not guarantee packet delivery, order, or error correction. This makes UDP faster but less reliable than TCP.
2. Speed: Because UDP lacks the overhead of establishing a connection, confirming packet delivery, and ensuring order, it is generally faster than TCP. This makes UDP suitable for time-sensitive applications where the occasional loss of packets is less detrimental than delays, such as live audio or video streaming.
3. Use Cases: Given these differences, TCP is used in scenarios where reliability and order are critical, such as web browsing (HTTP/HTTPS), email (SMTP, IMAP/POP), and file transfers (FTP), where the delivery of complete and accurate data is important. UDP is used in applications where speed and efficiency are more critical than perfect delivery, such as streaming services (video, audio), online gaming, and some broadcasting applications, where users prefer quick delivery over data integrity.
4. Flow and Congestion Control:
C. UDP is a datagram whereas TCP is a connection oriented service