What is the Difference Between TCP and UDP Protocols?


Featured, Tech Talk

In this article, we want to know What is TCP and UDP and How they work, and so what is the difference between TCO and UDP?

What are TCP and UDP

TCP or the transmission control protocol consists of four different layers: the network layer, the link layer, the transport layer, and the application layer. Each layer sends a message to a specific port address and enables communication.

When you click a link and sign in and do things, your web browser sends TCP packets to the server and the server sends TCP packets back. The remote system sends packets back to acknowledge it is received your packets.
TCP will receive the packets in order by them. the recipient sends messages back to the sender saying it received the messages.
If the sender does not get a correct response, it will resend the packets to ensure the recipient received them.
TCP is reliable, all packets sent with TCP are tracked so no data is lost or corrupted in transit.


UDP or The user datagram protocol is a connectionless internet protocol that allows communication between the server and the client.
the datagram is the same thing as a packet of information.
the UDP protocol works similar to TCP but it throws all the error-checking stuff out.
all the back and forth communication and deliverability guarantees slow things down.
When using UDP, packets are just sent to the recipient. The sender will not wait to make sure the recipient received the packet, it will just continue sending the next packets.
If you are the recipient and you miss some UDP packets, you can not ask for those packets again and there is no guarantee you are getting all the packets, but losing all this overhead means the computers can communicate more quickly. Therefore UDP is frequently used for live broadcasts and online games.

What is the difference between TCP and UDP?

In short, according to the above, both TCP protocol and UDP protocol are the most widely used internet protocols.
which TCP is a two-way connection but UDP is a simpler, connectionless Internet protocol.
Therefore we can Follow the important differences between TCP and UDP.

1– In TCP protocol, error-checking guarantees the delivery and preserves the order of the data packets.
But in UDP protocol, doesn’t guarantee error-checking and data recovery.
If you use this protocol, the data will be sent continuously, irrespective of the issues on the receiving end.

2– The UDP protocol, more reliable as compared to UDP.

3– In TCP the data is transmitted in a particular sequence which means that packets arrive in order at the receiver.
But in UDP, there is no particular sequencing of data.

4– TCP is slower and less efficient in performance as compared to UDP. Also, TCP is heavyweight as compared to UDP.
But, UDP is faster and more efficient than TCP.

5– Retransmission of data packets is possible in TCP in case packets get lost or need to be resent.
But in UDP retransmission of packets is not possible

6– One other case is for multicast traffic. UDP can be multicasted to multiple hosts whereas TCP cannot do this at all.

When would you use UDP and TCP?

Use UDP in applications where speed is more critical than reliability.
For example, listening to music and live chat, and video streaming.

But sometimes you need a reliable data transmission for your purpose, something that makes sure the receiver gets the whole message, however a little bit later. Like sending an email or chatting in chat rooms. in this case, you need to use a TCP protocol.

However, you can use SaturnVPN services to have different types of protocols VPN including PPTP, L2TP, Kerio VPN, Cisco AnyConnect, and OpenVPN.  And you can use both TCP and UDP protocols.

Just go to a VPN setup tutorial to install VPN and then go to pricing to buy a VPN package. You can test our VPN by free trial VPN account. If you have any questions you can contact us.