Paragraphs are blocks of text. They can be simple paragraphs as defined by the <P>.</P> tags or headings as defined by the <H1>.</H1> - <H6>.</H6> tags.
Paragraphs help you organize your content consistantly through out your webpage. For example, by actually using the <H1> tag to indicate a a primary heading in your document - instead of using plain text, made bigger with font tags, you can save yourself time - and make your webpage more accessible.
Format Paragraph Dialog Tutorial.