Use of class in css

Answer 1

In the CSS, a class selector is a name preceded by a full stop (“.”) and an ID selector is a name preceded by a hash character (“#”). The difference between an ID and a class is that an ID can be used to identify one element, whereas a class can be used to identify more than one.

Answer 2

The class in css is used to point out a Html tag that you want to edit.
I will explain u with a example :-

Suppose u dont use class and used a tag name then all the similar tag of that name got changed like :-

p{
transition : 1s linear;
}
p:hover{
TRANSFORM: scale(1.5);
}

But if u uses a class on a html tag and extends the starting p with that class name then only that html tag will got edited

p.nam{
transition : 1s linear;
}
p.nam:hover{
TRANSFORM: scale(1.5);
}

And sorry for my bad English!!!
😃