TCP UDP Show All Ordering: TCP rearranges data packets in the order specified. UDP does not order packets. If ordering is required, it has to be managed by the application layer. hide Error Checking: TCP does error checking UDP does not have an option for error checking. hide Usage: TCP is used in case of non-time critical applications. UDP is used for games or applications that require fast transmission of data. UDP's stateless nature is also useful for servers that answer small queries from huge numbers of clients. hide Function: As a message makes its way across the internet from one computer to another. This is connection based. UDP is also a protocol used in message transport or transfer. This is not connection based which means that one program can send a load of packets to another and that would be the end of the relationship. hide