<p>Pretty much what excelblue said…</p>
<p>I’ve never been in one but as far as I can see, it’s a group of people are very close to each other. Similar interests and whatnot. You guys are basically a family and are expected to back each other up. You have to prove you can be in the “family”. By being part of the family, you take part in their activities, and fulfill their expectations.</p>