I'm a little confused by extra dimensions. People seem to say different things about the 'extra dimensions. Everyone seems to say that there are 3 basic dimensions (width, height, depth), however some people say different things about what additional dimensions are, just wondered if someone can clear it up. Is a fourth dimension time, and the fifth, sixth seventh etc. the different dimensions related to string theory, or are the extra dimensions more geometrical, such as this image: http://www.dimension1111.com/images/dimensions1.png Or am I just getting completely muddled up? Sorry if I didn't really explain it too well, I'm terrible at explaining myself lol, and sorry if it's in the wrong forum.