What is an audio interface in the context of Pro Tools?

An audio interface plays a crucial role in the Pro Tools setup as it serves as a bridge between audio sources, such as microphones and instruments, and the computer. Its primary function is to convert analog signals from these audio sources into digital signals that the computer can process. Additionally, the audio interface often provides features like preamps, low-latency monitoring, and various input/output options, which enhance the recording experience. Without an audio interface, capturing high-quality audio directly into Pro Tools would be challenging, as most computers lack the necessary inputs and conversion capabilities for professional audio work.