This love is unconditional affection with no limits or conditions: completely loving someone.
It's when you trust the other with your life and when you would do anything for each other.
When you love someone you want nothing more than for them to be truly happy no matter what it takes because that's how much you care about them and because their needs come before your own.
You hide nothing of yourself and can tell the other anything because you know they accept you just the way you are and vice versa.
It's when they're the last thing you think about before you go to sleep and when they're the first thing you think of when you wake up, the feeling that warms your heart and leaves you overcome by a feeling of serenity.
Love involves wanting to show your affection and/or devotion to each other. It's the smile on your face you get when you're thinking about them and miss them.