Love cant be characterized in one question. And certainly not in that question. Love is different for everyone and no one person can say whether you understand love or not. Only you can understand when you truely get love, and when you do, it is the greatest feeling in the world. True love is a special thing that seems rare in this world and too many people think they know what love is when they really dont, but that doesnt mean theyre wrong, it just means they need to keep going out and finding love untill they finally get that real love that no one else but you and your partner can get. To try and say that love is taking a bullet for someone is stupid. I would take a bullet for anyone I know because thats the kind of person I am. Im willing to sacrifice myself to help others, but that doesnt mean I love them.
In other words...Love is more complicated than most people understand, but it something everyone gets at one point or another, even if it isnt "true love", everyone experiences a form of love with another person