Out of everyone in the world, there will only be a few who know absolutely everything about you. One of those people is none other than your best friend.

Everyone has someone they consider to be their best friend, and if you've ever seen the show "Broad City" on Comedy Central, you and your best friend can probably relate to Abbi and Ilana more than you would have originally thought.

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Your best friend will be brutally honest with you.

They only want the best for you, and that means they will never lie to you.

You guys have similar reactions to stupid things people do.

Ex-squeeze me?

Best friends are like a power couple. Don't mess with them.

You tend to have a lot of the same views.

All of their friends know you.

When you're constantly with your best friend, people tend to get you two are a package deal. That means they need to get to know you, too.

If you're going to do something ridiculous, you're going to do it together.

Your fights don't last long.

The minute something crazy happens to you, they are the first one you're going to run to tell. It's impossible to stay mad at your best friend.

They are there for the good times ...

and the bad.

God bless them for sticking around and being your rock even when you are at your ugliest.

They believe in you ...

and they're going to make sure you believe in yourself.

You two can be completely comfortable in silence.

You solemnly swear to always come to each other's rescue.

If you had to, you could perfectly mock each other.

When you know someone so well, it also means that you could nail an impersonation of them 100 percent of the time.

They can talk you into absolutely anything.

They will listen to you rant anytime.

But most of all, they would never replace you ...

and will slap some sense into you to make sure you never forget it.

What are best friends for?