They're places where people hang out and socialize or network.
Some have really strict bouncers whereas others will let just about anyone in as long as they're spending money and not shitting the place up too badly.
There are some that are so big and so popular that it almost doesn't matter if you prefer hanging out in another less popular one because no matter how you try, you'll never convince most of your friends to hang out at your favorite dive since everyone is at the big place.
They're places where people hang out and socialize or network.
Some have really strict bouncers whereas others will let just about anyone in as long as they're spending money and not shitting the place up too badly.
There are some that are so big and so popular that it almost doesn't matter if you prefer hanging out in another less popular one because no matter how you try, you'll never convince most of your friends to hang out at your favorite dive since everyone is at the big place.
...etc