What is an audio interface

Ive got one question up here. Which what is an audio interface? yes! as much as possible I wanted to know about this stuff as early as now though we have instructed then by next month that we should have this known for ourr music class but as I searched it over the net. I cant seems to understands it hence I’d made this post up for you to ask my fella music lovers out there if you know any of these stuff please? Your answers are much appreciated if you do care to share it with me on the comment box below. Okay, that will be all for now and I hope you can able to answer me here and let me knowledgeable about it.