Although we use base 10 for most counting today, it's worth noting that base 12 shows up in a lot of ways too. It's arguably more optimal, since it allows you to divide cleanly by multiples of 2, 3, and 4, rather than just 2 and 5.

Early numbering systems used base 12, which is why you'll see things like time (60 seconds, 24 hours) or angles (360 degrees) use multiples of it, because easy divisibility is useful for those things.