Friends are just acquaintances you know better than others. You start as acquaintances and as you develop the relationship, you'll eventually be friends.
Some people have so good relationships they even use the label "bestie", which is just a really good friend, who at the beginning surely was a acquaintance :)
Some people have so good relationships they even use the label "bestie", which is just a really good friend, who at the beginning surely was a acquaintance :)