What is difference between tag and tag?

The and tags, as well as the and tags, are HTML tags that are used to apply formatting to text, but they have different semantic meanings. vs : is a semantic tag indicating that the enclosed text should be strongly emphasized. It implies that the text is of strong importance or seriousness. is a presentational tag that traditionally represents bold text. It doesn't carry any inherent semantic meaning about the importance of the enclosed text.

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What is difference between tag and tag?