Out meaning in the board

Friends who have contacted the board should know the OUT in the board. What does this mean? The following is a brief explanation of what it means.

1. The circuit boards are all systems with certain functions.

2. The most common system form is the signal input system, which is transformed to obtain the desired signal and output to other devices.

3. The input is in and the output is out.

    A common circuit system such as a DAC is an input digital signal that is converted into an analog signal. At this time, out is used to output a converted analog signal, which is used to connect a device that requires an analog signal such as a headphone.