Scientifically speaking love is a combination of chemical, biological, and psychological factors that cause you to be attracted to another.
Non-Scientifically speaking love is that thing that puts everyone in a mood. It can light up your life or drag it through the depths of hell. Some say love can only be between certain people, I say it's for anyone. Love is deeply rooted emotions for another person. It can completely change a persons life, for the better or worse. Love is something everyone strives for, although it's not all that you need as The Beatles say it is, it is something everyone needs.
If you've never experienced love you should change that because it's truly amazing.
"Damn I really love that boy."
"Shit I never should've fallen in love her, all she did was tear my heart to shreds."