An audio signal is a representation of sound that can be captured, transmitted, or processed. It typically consists of variations in air pressure that our ears perceive as sound waves. These signals can be analog, where the sound is represented in a continuous wave form, or digital, where the sound is converted into binary data for easier manipulation and storage. Audio signals are used in various applications, including music production, telecommunications, and broadcasting. Devices like microphones and speakers convert sound waves into audio signals and vice versa. Understanding audio signals is essential for fields such as music technology, sound engineering, and telecommunications.