Question

What are superscript and subscripts

Answer 1

superscript refer to those characters that appear above the base line
for eg a²
here 2 is superscript

subscript is referred to those characters that appear below the base line

Answer 2

A subscript or superscript is a character (number, letter or symbol) that is (respectively) set slightly below or above the normal line of type. It is usually smaller than the rest of the text. Subscripts appear at or below the baseline, while superscripts are below

I hope this will help you