Directory services are systems that store, organize, and provide access to information about resources in a network. They help manage user accounts, devices, and services, making it easier for organizations to control access and maintain security. Common examples include Active Directory and LDAP (Lightweight Directory Access Protocol). These services allow users to find and connect to resources efficiently. For instance, when a user logs into a computer, the directory service verifies their identity and grants access to the necessary files and applications. This centralization simplifies administration and enhances collaboration within organizations.