Directory Service In this video let us take a look at Directory Service. What is it, anyway? Let’s just say there are two companies called A1 and A2. Each in their own building and let me call them A1’s building and A2’s building. By default, the employees from one company cannot enter into the other company’s building. If an employee from A1 asks for permission to enter A2’s building, using the employee badge from A1, then that employee will be denied access. In this case, each company maintains their own directory of employees and will not allow anyone else to enter into their building.