A headless server is defined as a computing device that operates without the use of a graphical user interface. Instead, it will receive inputs from elsewhere and will be able to function without the use of a monitor or peripherals, such as a keyboard or mouse. Its overall purpose is to provide services for users and other computers.

Many servers are headless, which can have a lot of advantages for a company. Perhaps most importantly, it allows for easy and compact storage. Large data centres will often use rack-mounted servers, where the computers are stored in large racks that keep them neat and easily stored away. They will usually have uniform storage compartments and will therefore be stored with other similar servers that are the same size and shape.

The advantages of a headless server over other kinds of server include security benefits, accessibility and usability. You can leave the server on, so it can always be reachable from the internet, yet it will be reasonably secure.