Step 10 Building a piano

Good Afternoon. I would like to know what is the objective of putting this symbol inside my css. For example in this step we can see the following code:

*, *::before, *::after {
  box-sizing: inherit;
}

What is the function of using asterik symbol (*). I’m not clear on this point!

* is a selector
it selects all elements of all types

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Thank you! I get it!

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