What is the meaning of subscripted text and superscripted text?

Answer 1

I guess you now chemistry and math

if you want to write H2O
the number 2 should be subscript

if you want to write x to power of 2
x2. 2 should be supeescript

so when we can to html if you want to write those symbols

H₂O
2 is subscripted text

x²
in this case 2 is super scripted text

hope this helps

Answer 2

https://www.w3schools.com/tags/tag_sub.asp
https://www.w3schools.com/tags/tag_sup.asp

Answer 3

X² will produce X². (² to the top of X)
X₂ will produce ² to the bottom of X.