A unidirectional microphone only picks up noise from a precise side of the microphone. Therefore, a user must be cautious to speak into it from that side in order for it to pick up sound with a honest amount of gain. An omnidirectional microphone is a microphone that picks up noise from the entire sides of it, a full three hundred sixty degrees. Therefore, a user can speak into it from the entire sides and the microphone can pick up the noise with superior achieve all around.