What is the best description of a square?

A square is a two-dimensional shape with four equal sides and four right angles. Here's a more detailed description:

* Four sides: All sides of a square are the same length.

* Four right angles: Each corner of a square forms a 90-degree angle.

* Parallel sides: Opposite sides of a square are parallel to each other.

It's also important to note that:

* A square is a special type of rectangle where all sides are equal.

* A square is a special type of parallelogram where all sides are equal and all angles are right angles.

Let me know if you would like to know more about squares or related geometric shapes!