As pointed out, the information is in the welcome FAQ.
If you don't wish to read that, the colors signify the level of the user, which consists of how many posts and upvotes they've made and received.
As @WilliamPierce pointed out, the information is in the welcome FAQ.
If you don't wish to read that, the colors signify the level of the user, which consists of how many posts and upvotes they've made and received.
(post is archived)