Hello, my friend. Stay awhile and listen...
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In the ancient history of OT lore, you would have to login on a server with 1/1 and play on a character that would reset everytime you logout. If you found the OT interesting, you would ask a GM if he could manually create a private account for you. And he would have to modify XML files, or add entries manually into the database, often by typing SQL queries by hand.
Then a GM got too tired of writing new accounts for new players, it was easy to mess up and crash the server if he had a typo. So he created a website where players could register an account on their own without his intervention, thus, an Automatic Account Creator was made. (AAC).
It was such a big milestone for the OT community, that we kept using the acronym AAC when creating more modern and comprehensive website projects. It is an acronym lots of web developers are fan of, as they too aspire to continue that evolution.