The DCI server is the heart of the cinema. It is a specialized player that handles films in the cinema. Today, DCI servers are only produced in 4K and are also backward compatible with 2K DCI projectors or DCI LED walls. The task of the DCI server is not only to play the film, but also to control all technologies in the cinema such as the DCI projector, sound system, lighting, masking, 3D systems, but also related technologies such as HVAC, EPS, intermission music, security, etc. That is why the DCI server is rightfully called the heart of the cinema. Therefore, sufficient attention should be paid to choosing the right DCI server.