The Defined texture pack is an amazing pack and one of my overall favourites. Basically it does one thing and it does it well. Defined takes all of the default textures then puts them in an HD format and make them look more detailed and sort of 3D. The textures all have a sort of Bump mapping effect to them. For example stone bricks, you will notice each brick on the texture actually has perfect shading around the edges of the brick to make it look like they stick out of the block! The pack is made by Ningamer from the minecraft forums and I highly recommend each and every one of you go download this amazing pack! You will never want to go back to the old boring and flat default texture pack.