What is love

Is there a such thing as love?
I hear that word so many times from so many different people, but I'm curious as to what it really means to them...Everytime I think I have figured out exactly what love is or isn't someone comes into my life to show me that I truly don't know what it is... Well let me correct that saying... I know what love is, but do i know what it is for someone to truly love me... to a certin extent... I ask myself if I am worthy of love... Will true love ever come to me without me having to compermise myself? or my value??
What is love?