IIS server binding types
Before understanding binding, you must be able to understand the concept of these terms.
An IP address is a number identifying a computer or another device on the Internet. IP addresses uniquely identify the source and destination of data transmitted with the Internet Protocol.
Port Number :
A port in computer networking is an access channel for communication between two devices. When a service (server program) initially is started, it is said to bind to its designated port number. As any client program wants to use that server, it also must request to bind to the designated port number. Port represents the numbers and basically specific to the protocol. Port numbers are from 0 to 65535. Ports 0 to 1024 are reserved for use by certain privileged services whenever there are exchanges of data or communication present, there must be a port for this.
Website with IP address binding :
In this we specify the IP address for each of our website, Every website has a unique IP address. For example we bind IP address 192.168.43.51 with website namewww.example.com whenever an HTTP request coming to 192.168.43.51 will be served by this website irrespective to the host header
for further detail visit: https://securitythread.blogspot.com/2020/05/iis-web-server-binding-types.html