Why id selectors are used?

Question

we can style without id selector.
Anybody please explain what is the use of id and class selectors to style by css

Answer 1

ID & Class Selectors 👇
http://www.htmldog.com/guides/css/intermediate/classid/

my code 👇
https://code.sololearn.com/Wlu6v96Ve03f/?ref=app

https://www.sololearn.com/Discuss/591088/?ref=app

Answer 2

thank you maxcook

Answer 3

when you style inline,the whole code gets messed up,it becomes very hard to make adjustments to it,thats why external css is advisable