A line is a 1-dimensional object. Put a bunch of lines together, and you get a square, a two-dimensional object. Put a bunch of squares together and you get a cube, a 3-dimensional object.
After this, human perception starts having trouble, because we can only perceive three dimensions, but if you could put a bunch of cubes together in a 4-dimensional space, that would be a tesseract.
[This site](https://brilliant.org/wiki/tesseract/) has a more detailed explanation and a video that shows what a tesseract would look like to us 3-dimensional beings if we managed to interact with one.
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