USB microphones are mostly used for video voice-overs, podcasts, internet radio, chatting, conferences, interviews, gaming, and so on and on. They bypass your computer’s built-in soundcard and set you up for recording in seconds without the need for external devices (like audio interfaces, preamps, mixing consoles, etc). That’s because USB microphones include a built-in audio interface. First off, what is a USB microphone? It is a microphone that you can plug in straight to your computer and start recording right away.