Have you ever wanted to easily achieve lucid dreaming on a regular basis? (i know i have) This is a FANTASTIC resource about Lucid Dreaming! It covers all sorts of questions with in-depth yet easily understandable responses.
In short, Lucid Dreaming is when you realize that you are dreaming and you're able to alter your own virtual reality in any possible way you like.
From the source:
Lucid Dreaming is knowing that you are dreaming while you are doing it. When you know that you are dreaming, you can also alter the dream course. And with practice you can also develop full control over your dream, you will be able to create and change the environment and change your own appearance. It will be you that are in control of the dream scenario. You can do whatever you want to do. Live out your wildest fantasy, or just sit down and chit chat with someone.. And believe me when I say that Lucid Dreaming can be much more fun than waking reality.