LOVE?????????????????????????????

What is love?

This question, I believe, at some point in life, every person asks themselves. The truth is I have no idea what the answer to this could be. What I do know is that there are so many different forms, that one can see without even trying, which makes me sure that every one's idea of it and answer to this question is different.
I have never been in love, the love I am talking about is strictly the being in love kind, not the you're my sister so I love you kind.
I do not remember when I first heard the word love being used in this sense, I do not recall how the concept of love came into my brain. No one sat down and explained the concept to me, I assume that I understood it through my childhood interaction with media, but as far as I remember I clearly understood that there was a feeling called love and that was what was being portrayed in whatever movie or show I was watching.
So I wonder is it something we learn about through our almost daily interaction with it in our daily lives.
Anyhow, no matter how I was introduced to it, the truth is its the only feeling that I cannot understand and I believe there are many like me. I have seen it, so I do believe it exists, but how do you feel like that for someone, some stranger?
My parents married as strangers (an arranged marriage which is quite common here in Pakistan). Yet they love each other and it is completely visible, then my Uncle had a love marriage and their love is visible too. A lot of my friends are falling in love, some gradually others within hours. Some are extremely serious others are just testing the waters. Love seems to me to happen to all, yet I do not understand it. See in most cases it leads to marriage or partnership and I get it, but sharing a life with someone requires hundred percent trust, honesty and being comfortable. See in my brain you can't love until or unless you trust and trust can only be there if you are completely honest. Well that comes with time, can be an answer but how can you want to leave your own independence and be attached to another person for the rest of your life? Or even for a while. Honestly I get irritated easily so how can two people spend so much time together and not get tired.
How does one give so much importance to anyone, any stranger?
How do you compromise? Why would you compromise? How can you want to be with someone to give up so much for them?
If anyone has any insight please enlighten me.