Equatorial mounts are so designed that one axis can be aligned parallel to the Earth's rotational axis. This means that the telescope only has to be rotated about this axis - called the hour axis - to compensate for the Earth’s rotation. This allows long exposure times during astrophotography without experiencing the annoying ‘field rotation’ effect.
The GoTo control allows astronomical objects to be selected from the built-in database. The motors then automatically slew the telescope to align with the object selected and keep it automatically centred in the eyepiece or on the camera sensor.