A tesseract is a 4 dimensional cube.
If you think of a square drawn on a piece of paper as 2 dimensional and then a box as 3 dimensional, a tesseract is the same thing projected into 4 dimensions.
It’s hard to visualize as we’re not wired that way, but there are some [decent examples](https://en.wikipedia.org/wiki/File:Tesseract.gif) of this expressed in 3 dimensions.
Latest Answers