A socket is an endpoint of a two-way communication link between two programs that you can name and address in a network.
graph LR
A --> S1((socket))
A[PC 1] -.- B[PC 2]
B --> S2((socket))
graph LR
A[Modem <br> public IP] -.- B[Router]
B --> C1[C1 <br> private IP]
B --> C2[C2 <br> private IP]
B --> C3[C3 <br> private IP]
graph LR
C1[PC 1] -- Hi --> A[Server <br> 192.168.0.15]
C3[Phone] --> A
A --> C4[PS4]
A -- Hi --> C2[PC 2]
| TCP | HTML |
|---|---|
| Reliable -> detects packet loss | Sends one Datagram |
| Connection-based | No order |
| Sequential | No Guarantee |
| Byte Stream | Real-Time, Faster |
| Keeps up connection | Less Network and PC stress |
Ex. Skype uses UDP for calls and TCP for chats/messages.