Need of Domain


I m Navision coordinator in my company & my partner again n again ask me about DOMAIN

So please Answer these questions:

Ques1: What is Domain?

Ques2: Why we need domain for web services or RTC?


A group of computers and devices on a network that are administered as a unit with common rules and procedures. Within the Internet, domains are defined by the IP Address. All devices sharing a common part of the IP address are said to be in the same domain

Navision RTC requires Windows Authentication and because of that it is required domain.