The Internet runs on packets of data.
* IP : Internet Protocol : [0][1]
UDP is a simple wrapper around that to include a few extra things such as ports and the like.
* UDP : User Datagram Protocol : [2][3]
Transmission Control Protocol (TCP) describes how to break a stream into packets and send them over IP, to reassemble them at the other end, and send back acknowledgements to guarantee deliver. It also has mechanisms to help prevent congestion.
* TCP : Transmission Control Protocol : [4][5][6]
If you read, or at least skim those, then you will be able to ask a proper, well-formulated question.
However, the short version:
Q: Ask HN: How do TCP/IP packets work?
A: Very well, thank you.
[0] https://en.wikipedia.org/wiki/Internet_Protocol
[1] https://tools.ietf.org/html/rfc791
[2] https://en.wikipedia.org/wiki/User_Datagram_Protocol
[3] https://tools.ietf.org/html/rfc768
[4] https://en.wikipedia.org/wiki/Transmission_Control_Protocol