We live in 3 D World. We can see, feel, touch the things. We uses our senses to know the details of surroundings. Our world which we see having 3 Dimensions which means it has length, height and depth.
We cannot see across the things. We cannot cross the walls. We cannot pass through objects. We live in a world which has many limitations. We move with limited speed.
Our Scientists, occult theorist, religious persons give us the knowledge about dimensions. We have 7 dimensions. Each dimension having its own properties, its own rules. The people/entities lives in these dimensions are having different properties because they are bound to the rules of that dimensions.
The 4th dimensions entities can pass through any 3 D object, and can go anywhere anyplace of 3 D world. Similarly 5th Dimension entity has ability to see all 4th dimension beings. The upper we move the more capabilities entities will have.
