When I like someone a lot. When I want them in my life and try to be nice when they annoy me. When I feel bad for being selfish and like doing things that make them smile.
I don't know if there's some mystical thing that separates love from really liking someone but if it's those physical feelings in the heart then yeah I get those too.
It's a driving force that provides one with the will to carry on. Our bodies are nervous systems with filters that individulizes us all, or seperates us if you will. So the ego comes into play and something like love in many cases can be painful when those we love do not respond in our favor. Only in love or the persuit of it keeps us, as everyone's preference is to be liked, otherwise we'll be miserable. Love has a hand in every emotion, even what we consider to be negative. Those who recognize what love is while practicing it to it's fullest will love even their enemy, and will have the capacity to forgive almost anything. For those who can forgive anyone for absolutely anything, will enjoy the benefit of inner peace, and will be equipped to live comfortably throughout an eternity, for without love eternity will provide unlimited hardships. Love is what it is. Medulla said it well when she mentioned how love is not an emotion, but a state of being. Without love, we wouldn't have the capacity to hate, or carry on with argument or debate. The best thing one can do to make the most of the divine force, is to let go, and just be the person you would be if everyone loved you, then you may find how after some time, it becomes real. Expect nothing in return to avoid dissappointment, rely on no one to manage your happiness, and just give. Your value will increase on every level, and what most people think love is, you'll have pleanty of that complete with a massive funeral.
Love is one of those hard to define, abstract topics, so thank you for inviting us to share our own definitions :). I am not in the mood as of right now to pull something out of my ass, so I will at least say what I believe I love. I think I love my older brother because I somewhat care for his continued existence, and am somewhat attached. I also really love myself, a lot. Idk about anything else. "True love" is nothing more than strong, temporary sexual passion.