What is Active Directory
Active Directory is Microsoft’s directory services introduced in 2000. It is a database that keeps track of all kinds of objects on a network such as user accounts, passwords, computers, and many other things. Active Directory allows administrators to setup security, push updates, and secure computers with group policies.
Active Directory uses domains to subdivide a network. A domain is hosted by a special server known as a domain controller (DC). A domain controller is such an important part of an active directory network that a minimum of two domain controllers should be used, however some large enterprises could have 100’s of Active Directory Domain Controllers.
A domain controller is also tasked with authenticating and authorizing all users and computers in an Activive Directory Windows domain type network
Active Directory uses Lightweight Directory Access Protocol (LDAP).
Active Directory arranges information in the form of objects.
Azure Active Directory User Tools
What is Azure Active Directory
Creating users for Azure Active Directory and office 365 portal
Adding Office 365 and Azure Active Directory portal users to Groups
Azure AD Connect