Active Directory is a Microsoft technology that runs various services and features used to identify and manage how network resources are accessed . It was first released with windows 2000. It stores data into objects. It provides Central Management.
There are 5 Roles of Active Directory namely:
Active Directory Domain Services:
Stores data centrally, manages user and domain communication. Users, Computers , Policies
Active Directory Federation Services:
Is a Single Sign On Solution by Microsoft. It works by providing a proxy service between the users application and active directory.
Active Directory Certificate Services:
This is a role that allows you to create a public key infrastructure (PKI) ,provides public key cryptography, digital certificate and digital signatures, Provides a way of building your own Certificate authority.
Active Directory Rights Management Services:
Used to protect data by enforcing policies.
Active Directory Light Weight Directory Services(LDAP):
Its an application protocol that is used over a IP network to manage and access the distributed directory information service, This is usually organised in a hierarchical structure.