What is an "audio interface" primarily used for?

An audio interface is primarily used to connect microphones, instruments, and other audio devices to a computer for recording. It serves as a bridge that converts the analog signals from these instruments and microphones into a digital format that can be processed by a computer. This functionality is essential for recording high-quality audio since it allows for multiple inputs to be managed effectively, ensuring clarity and fidelity in recordings.

Additionally, audio interfaces often come with features such as preamps, phantom power for condenser microphones, and low-latency monitoring, which further enhance the recording experience. While other options may involve audio processes, they do not directly pertain to the primary function of the audio interface itself, which centers around the initial stage of capturing audio for further manipulation in a digital audio workstation (DAW).