Not all love is unconditional. The one from parents is usually unconditional. They give love without any conditions, showering their love on their children. If you are lucky, you can get unconditional love from your spouse. It means that you have feelings of adoration for someone whether or not they return those feelings or care for you in any way. It is a special bond.
Sometimes, the luckiest people get to love a person unconditionally who loves them back. However, most of the time, our love is steered by wants. If a person fulfills our needs and abides to certain standards, we give them love.