What is port scanning?
It is similar to a thief going through your neighborhood and checking every door and window on each house to see which ones are open and which ones are locked.
TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are two of the protocols that make up the TCP/IP protocol suite which is used universally to communicate on the Internet.
Each of these has ports 0 through 65535 available so essentially there are more than 65,000 doors to lock.
The first 1024 TCP ports are called the Well-Known Ports …