How do i explain a Punnett Square?!??

A punnet square is an idea generated by geneticists which has been used to describe how many different ways x amount of items can be combined with y amount of items

in genetics we see

x y

x xx xy

x xx xy

in mathematics we can use it to foil

2x 3

2x 4x^2 6x

3 6x 9

so short and simple a punnet square is an idea that is used to generate all the possibilities of x and y combined.