As you can see my Steam profile says I'm level 20:
What exactly do levels do? Do they provide any sort of benefits? I've noticed the following as well:
Some of the other users have different colored circles around their levels. Do they get additional benefits that other lower levels don't get?
Best Answer
The higher your level the more "showcases" you can add to your profile which includes:
You'll want to join the Steam trading card group to level up your profile.
Joining the Steam trading card group is no longer required.
From the Trading Cards FAQ: