You just hang out more I guess

If you get arrested a friend will come to the jail to help you post bail.

I may a new organization , and meet a lot of people . Those are acquaintances , but may not be friends , yet . Friends are the ones you keep hanging out with , because you enjoy their company , and over time , you get to know them better simply acquaintances . If you're really lucky , over time , if you continue to enjoy one another's company , you may be lucky enough to become close friends . And may , eventually , begin doing other things together , in addition to being at the same organization you originally joined .

Only you can decide this for yourself. For me a friend is someone with whom I like to spend time even when we're doing basically nothing.