Two-dimensional: two straight lines intersect or move together to form a plane, which can be said to have length and width (that is, the so-called length and width can be understood as the size of the area)
Three-dimensional: the place swept by the surface movement or the inside of the surface rolled up can form three dimensions, which is what we live in: space has length, width and depth (length, width and height), which gives the possibility of three-dimensional "crossing". It is pointed out that two-dimensional objects can disappear from one place and three-dimensional objects can appear in another place.
Four dimensions: On the basis of three dimensions, plus time continuity, that is to say, there is something in this space and how long it will last in a certain state. This is the concept of four dimensions. At different times, the same object (you can also be imagined as you) can be regarded as two points, and there can be a connecting line (to prepare for understanding higher dimensions, this connecting line can be imagined as a one-dimensional space with higher dimensions).
Five dimensions: (It's hard to describe it in words from here. Five dimensions and four dimensions are like the relationship between two dimensions and one dimension. When describing four dimensions, it has been said that the same thing can be connected at different times. After bending this connection, a so-called five-dimensional space is formed. After reaching five dimensions, it gives a theoretical basis for travel time, but travel time exceeds your life for a long time.
Six dimensions: the relationship between six dimensions and five dimensions is also similar to that between three dimensions and two dimensions. The six-dimensional theory enables us to "travel" through any time in an instant, making time a headless and tailless whole. Look at this (the last chaos of the universe = the beginning of a new brewing big bang)
Seven dimensions: in the seventh dimension, the concept began to put forward that there are other universes, and each universe regards it as an infinite body, but in the seventh dimension, any universe is just a point, and each universe may have different gravitational light speeds.
Eight dimensions: The points of the universe in the seven dimensions are interconnected, and another point will appear. These points are also connected.
Nine-dimensional: Rolling up the eight-dimensional midline can form a nine-dimensional "space".
Ten dimensions: imagine the space formed by nine dimensions as above a point. Some people may ask why there are no more than ten dimensions. Because after the tenth dimension, according to our understanding, there is no room for any other objects.