A cube is a square box (or block) shape:

The faces of a cube are all square.

Here is a rotating view of a cube:

A cube has 6 faces - the top, bottom, and 4 sides.

It has 8 corners (vertices).

It has 12 edges.

Here is a cube of side $a$:

The width, height and length of the cube are all equal to $a$.

This means that the volume is:

$$ volume = a \times a \times a = a^3 $$

The volume is $a$ *cubed* (this is where the term cubed comes from).

Each of the 6 faces of the cube is a square of size $a$ by $a$.

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