TCP VS UDP- Difference and Comparison in 2020

TCP and UDP –

TCP and UDP both are used for transferring data or packets on the internet or Intranet. Both perform the same job but the way is different. In this blog, we are discussing the difference between TCP and UDP i.e. TCP vs UDP.

TCP stands for “Transmission Control Protocol”. UDP stands for “User Datagram Protocol”. The main difference between UDP vs TCP is that the TCP is connection-oriented while UDP is connectionless.


In TCP after the connection is set up, bidirectional sending of data is possible but in UDP, packets are sent in chunks. TCP is more reliable than UDP but UDP is faster than TCP.

Header size of TCP is 20 bytes while Header size of UDP is 8 bytes. UDP doesn’t have error checking mechanism that is why it is less reliable but is faster in data transferring while TCP is reliable but comparatively slow as it keeps the data smooth and checks error.

Related- Common TCP

Key Difference between UDP and TCP

  • TCP stands for “Transmission Control Protocol” while UDP stands for “User datagram Protocol”.
  • TCP is the connection-oriented protocol while UDP is connectionless protocol.
  • TCP is more reliable than UDP.
  • TCP uses both error detection and error recovery. UDP works on a “best-effort” basis
  • UDP is faster for data sending than TCP.
  • UDP makes error checking but no reporting but TCP makes checks for errors and reporting.
  • TCP gives a guarantee that the order of data at receiving end is the same as on sending end while UDP has no such guarantee.
  • Header size of TCP is 20 bytes while that of UDP is 8 bytes.
  • TCP is heavyweight as it needs three packets to set up a connection while UDP is lightweight.
  • TCP has acknowledgement segments but UDP has no acknowledgement.
  • TCP is used for an application that requires high reliability but less time-critical whereas UDP is used for an application that is time-sensitive but requires less reliability.


A More detail comparison between TCP vs UDP is shared below –

tcp vs udp

Reference :-

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