What is felt??

I just realized I am blabbering on about felt and most people don't even know what it is. Actually, I don't even know what it is but I was introduced to it by one Gadora Wilders. She was given a bag of the stuff and told to do with it as she pleased. I am going to get some photos of her amazing birds and post them up soon. In the mean time, I wanted to show you the tools I am working with to make my lil creations. I am not claiming to know what I am doing, but it's working. Here are the needles I use to stab the lil critters to life along with my foam block so I don't make a thousand hole marks in my table or hand.

This here is my bog'o'felt along with the lil red bag I just got at Joanne's. The lil bag was $4.00 but a lil goes a long way.

I hope this helps those who don't understand what felting is. Again, any advice or suggestions are welcome. Happy Felting.
~J