why we use<sub> & <sup> tags

Answer 1

<sub> to subscript the text
<sup> to superscript the text

Answer 2

Sub script tag is used to differentiate normal text with base text.

For example H20 is written as H₂O

Super script tag is used to differentiate the normal text with upper text.

For example x3(x cube) as x³

sub - Lower to Normal text
sup - Upper to Normal text

Answer 3

Thanks sir