They make you laugh even on your bad days and make all problem seem easy to overcome as long as you have them by your side.
Best friend can be many things, your inspiration, your hero; bestfriends help each other to become better people by using honest, constructive criticism that sometimes hurts to hear, but is all for the best in the end.
Best friends are the ones that bring up touchy topics with you, even if it will risk you being angry with them because they care more about your well being.
Best friends are those that bring out the best in you.