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The strong tag is another phrase element. It make text bold in most browsers.
You may wonder why there is a (bold) tag and also a tag since both are displayed in bold type.
Technically, the strong tag was meant to provide emphasis aurally for people surfing the web using screen readers, while the bold tag was meant to provide emphasis visually.
A word stressed with the strong tag should be stressed aloud by the screen reader software, but a word stressed with the bold tag won't necessarily be stressed by screen readers.
Here's an example of usage:
I love a good thunderstorm.
That sample looks like this on a web page: