What is love?

Today, I wonder if anyone really knows what "love" is.  The word is thrown around like it is a period in a sentence.  You hear about so many divorces these days in our nation.  Valentine's Day is in two days and I caught myself this week listening to friends and customers in various stores as they shopped.  It is sad that some of us need a holiday to show the people we love how much we care.  Shouldn't we do that everyday?  Does a dozen roses or a stuffed animal one day out of the year really prove anything?  I want the people I love to know that all year long and not ever doubt it.  Not because of how much money I spend on them, but because I am always there to listen or talk or because of the little sacrifices I make for them.  There are different levels of love I believe.  There is the love we have for our family and our children: the "blood is thicker than water" type.  Then, there is the unconditional love we have for our spouses or mates.