Difference between TCP and UDP?

TCP -Transmission Control Protocol -It is a Protocol used in connection oriented networks  
 
UDP - User Datagram Protocol - It is a protocol used in connectionless networks Here the data is transfered as packets.

TCP-Transmission Control Protocol. 
Protocol responsible for control over Transmission of data over the network. 
It breaks the data into packets. 
It supports error correction. 
 
UDP-User Datagram Protocol 
It also breaks the data into packets like the TCP. 
But it does not support error correction.

TCP-Transmission Control Protocol.TCP is a connection-oriented protocol.  
A connection can be made from client to server, and from then on any data can be sent along that connection. 
It supports error correction in the transmitted data. 
So it is a reliable protocol. 
 
UDP-User Datagram Protocol 
A simpler message-based connectionless protocol. Using UDP we can send packets of data across the network. But it does not support error correction in the transmitted data. 
So it is not a reliable protocol like TCP. 

TCP-Transmission Control Protocol.TCP is a connection-oriented protocol.  
A connection can be made from client to server, and from then on any data can be sent along that connection. 
It supports error correction in the transmitted data. 
So it is a reliable protocol. 
 
UDP-User Datagram Protocol 
A simpler message-based connectionless protocol. Using UDP we can send packets of data across the network. But it does not support error correction in the transmitted data. 
So it is not a reliable protocol like TCP. 

TCP-Transmission Control Protocol.It is synchronous in nature.It supports error correction. 
UDP-User Datagram Protocol.It is asynchronous in nature.It do not support error correction.

The main difference between TCP and UDP is, TCP is connection orinted protocol means it will get an acknoldgement for the packet it has forwarded

UDP is also faster than TCP- partially because it does not require an acknowledgement of reciept. However the difference is in the milliseconds and not normally a factor.

In addition, UDP is the protocol that you would usually use with voice application.  If voice doesn't go through on the first try, there is no reason to resubmit, since a voice byte will lose it's value if it late, therefore you have no reason to need an acknowledgement of reciept.

TCP-Not Used for real time applications

UDP-Mostly used for real time applications

TCP is a protocol based on a connection between two computers. It is used for normal Internet traffic and applications such as web servers, Ftp, etc. UDP is a Protocol based on connectionless communication. UDP is ideal for applications like video streaming and online gaming, where lost packets don't need to bre retransmitted and speed takes precedence.

TCP having reliable transmission than UDP udp doesnot having the reliabletransmission through out the network

To Phanindra,
Sir how do you sayfor realtime UDP is use and not the TCP.
Can you explain me how?
Helps me to decide in myreal time application

Thanks

TCP UDP
connection oriented protocol connectionless protocol
more reliable less reliable
error correction no error correction

TCP is a connection oriented protocol and UDP is a connection less protocol such as wireless phones.

TCP gives acknowledgement to the recipients where as UDP does not give any acknowledgement to the recipients.

UDP is faster the TCP.