A Directory Service is a software application that stores, organizes, and provides access to information about resources in a network. It helps manage user accounts, devices, and services, allowing administrators to efficiently control access and permissions. Common examples include Active Directory and LDAP (Lightweight Directory Access Protocol). These services enable users to find and connect with resources easily, such as printers or shared files. By centralizing information, a directory service enhances security and simplifies management tasks, making it easier for organizations to maintain their IT infrastructure and ensure that users have the appropriate access to resources.