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Which of the two is correct terminology?
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There is no difference between "utf8" and "utf-8"; they are simply two names for UTF8, the most common Unicode encoding.
UTF-8 is the dominant encoding for the World Wide Web (and internet technologies), accounting for 98% of all web pages, and up to 100.0% for some languages, as of 2022.
Why use UTF-8? An HTML page can only be in one encoding. You cannot encode different parts of a document in different encodings. A Unicode-based encoding such as UTF-8 can support many languages and can accommodate pages and forms in any mixture of those languages.
The answer is that UTF-8 is by far the best general-purpose data interchange encoding, and is almost mandatory if you are using any of the other protocols that build on it (mail, XML, HTML, etc). However, UTF-8 is a multi-byte encoding and relatively new, so there are lots of situations where it is a poor choice.
That depends on where you use it...
The name of the encoding is UTF-8.
A dash is not valid to use everywhere, so for example in .NET framework the property of the System.Text.Encoding class that returns an instance of the UTF8Encoding class that handles the UTF-8 encoding is named UTF8.
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