We exist in 3-D world, and we are aware TIME is considered as the fourth dimension. Of late, we are reading in novels and watching movies - science-fiction - about extra dimensions. Most of these novels and movies are based on scientificresearch, of course - but there is always some exaggeration to make them sensational. While no one has actually seen, heard of, or experienced the other dimensions, here is what the scientists say:Dimensions are simply the different facets of what we perceive to be reality. We are immediately aware of the three dimensions that surround us on a daily basis – those that define the length, width, and depth of all objects in our universes (the x, y, and z axes, respectively). Before we consider the dimensions, we need to consider the basic unit of all things in the universe: a point. the concept of a singular finite point. We start from that point.Dimension No. 1: A line. Any line. A line that stretches from one point to another, without any width to speak of. such an entity does not really exist in the way we perceive the world, as everything in our practical view has tangible length and width (no matter how small). But as an abstract concept, we can grasp this easily. Dimension No. 2: A plane — that comes to be when you add width to the line. Although a plane is easier to imagine than an impossibly thin line, it still can’t quite exist in the reality we know, as everything on Earth, even a sheet of paper, has some degree of depth or thickness. However, a plane can exist as a flat surface viewed straight on: a floor, wall, tabletop, photos, even the TV with the images. Dimension No. 3: Space. This is our world. Just as a line becomes a plane when you tack onto it from the side, a plane becomes an object in our world when you “inflate” it from another angle. We see everything with length, width, and depth — but that’s it. The third dimension involves depth (the z-axis), and gives all objects a sense of area and a cross-section. The perfect example of this is a cube, which exists in three dimensions and has a length, width, depth, and hence volume. According to scientists, beyond these three lie the seven dimensions which are not immediately apparent to us, but which can be still be perceived as having a direct effect on the universe and reality as we know it. These extra dimensions are not named, as yet. Dimension No. 4: This is Time, essentially. Scientists believe that the fourth dimension governs the properties of all known matter at any given point. Along with the three other dimensions, knowing an objects position in time is essential to plotting its position in the universe. Picture yourself at this very moment. Now, imagine yourself five minutes ago — or five days, or five years, To grasp a world observed from the Fourth Dimension (as ours is from the Third), picture each of these variations of yourself as physically connected along the line of time. The message "I will meet you at home tomorrow" has more meaning if we say "I will meet you at home tomorrow at 10.00 A.M. The other dimensions are where the deeper possibilities come into play, and explaining their interaction with the others is where things get particularly tricky.Dimensions No. 5 : According to Superstring Theory - which is an attempt to explain all of the particles and fundamental forces of nature in one theory by modelling them as vibrations of tiny supersymmetric strings - the fifth and sixth dimensions are where the notion of possible worlds arises. If we could see on through to the fifth dimension, we would see a world slightly different from our own that would give us a means of measuring the similarity and differences between our world and other possible worlds.