Audio may refer to any of the following:
1. Audio describes any sound or noise in a range the human ear can hear. An audio signal is measured in hertz and on a computer is generated using a sound card and heard through speakers or headphones.
Any digital information with speech or music stored on and played through a computer is known as an audio file or sound file. One of the most common audio file formats used today is MP3. Clicking the triangular button on the following embedded player plays a short MP3 file in your browser.
How is an audio file created?
To record a voice or music played outside a computer, an audio file is created using a microphone to record the sound it detects. The sound is converted to a digital signal the computer uses to create the audio file. Audio files can also be created using software running on a computer. For example, a person could use an audio program, like Audacity, to record the sound played in a video file.
What are common file extensions and types?
MP3 is the most common audio file extension. However, there are other audio file extensions and types. For a list of the most common audio file types, see: What are the most common file types and file extensions?