A camera microphone is an important part of a video recording. An external microphone has a wider frequency range, a higher directional sensitivity and often more possibilities than a built-in microphone. The different microphones are often also suitable for a particular application or environment. This also depends on the type of microphone. So you can record isolated sounds far away from you with a shotgun microphone. A stereo microphone is more suitable for recording the ambiance of a room.