First, let me try and explain the many meanings of the word "love". Love can be used to express pleasure (as "I loved spending the day with you") or to express the feeling one has for another (as "I love you"). By now we can see it is a matter of interpretation. And I must remeber you, dear readers, that in different languages, the word "love" is translated in different ways according to the meaning ("love" as pleasure is translated to "adorar/gostar" in portuguese, and "love" as the feeling is translated as "amar" in portuguese). The "love" I will be referring to is the sentimental one.
How to explain love? It is not easy to explain what love is. One has to feel it to know what it is. But the ultimate question now is how to know we are in love? That is easy to explain. Have you ever felt like you can't get away from someone? Ever felt your heart pounding in your chest so hard it hurts you when you are close to someone or when you think of this person? Ever felt excited when you know you are going out with someone? All you think about is that person? Well then, I managed to explain what is the feeling of being in love with someone.
I believe I speak for all of us who are in love when I say that love is definatelly the most wonderful feeling ever.