What is child and descendant combinators?

#1

i did not get that what is the use of these two combinators and what is the difference between them?

#2

Descendant will pick all the tags inside the parent tag even if they are under another tag for example:
div p will pick all p tags in div even if p is under another tag inside div:

> <div>
> <section><p>HI</p></section>
> </div>

And child combinator(div > p) will not pick this because it is under section tag but it would definitely pick this:

> <div>
> <p>HI</p>
> </div>

These two links explain the difference very nicely:
https://www.w3schools.com/css/tryit.asp?filename=trycss_sel_element_gt
https://www.w3schools.com/css/tryit.asp?filename=trycss_sel_element_element

#3

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