What is the deffirence between em and Italic tag in HTMl?

Em and Italic tag is look to the user same then why we use diffrent tag ?

MDN has a decent explanation; an excerpt

<strong> and <b> are a similar pair. And there's also the difference between <em> and <strong>.

As per CSS "em" tag definition:

em {
  font-style: italic;
}

it's completely equivalent.

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Not sure why you post this on an Arduino forum.