Formatting elements are used to format the html documents and display special types of texts, each element has different format and style.
You can apply these elements to any element to decorate it.
Bold is a formatting element used to make font's weight bold, bold means make font weighted, bolded text or content has no any extra importance.
<b>Content</b>
Or
<tag><b>Content</b></tag>
You can apply bold element to any element and use any where within a HTML document.
Bold is a pair tag and output of bold element is weighted text like you can see in above example.
Open notepad or any other text editor, follow the following points.
save file with name task.html or task.htm and then open it using any browser and see results.
Don't forget bold is less important element than Strong Element