What is this thing called “love”?

We say it all the time. We think it all the time. And yet, we spend our entire lifetimes trying to figure out what it is. And some of us never figure out what love is. Some of us are clueless as to what love really is, and we spend our lifetimes looking and looking for it, in constant misery and unhappiness. And so, some questions --

1. What is this thing called “love”?
2. What do we mean when we say “I love you,” or when we ask “Do you love me?”
3. Are there different kinds of love, or is there only one love which is exhibited/experienced in different ways or varying degrees?
4. Is the concept of love objective, or is it different for each person? Does the definition of love change depending upon the situation?
5. Is the religious and Biblical concept of love different, separate, and/or distinct from the “romantic” concept of love?
6. Is being “in love” different from love generally? Is there a difference between being “in love” and being “in” love?
7. Is being “in love” different from being “in like” with someone?