In HTML and XHTML, span and div tags are used to describe content that cannot be properly described by other, more semantic tags. The div tag defines a section within an HTML or XHTML document.
Proper HTML markup language requires that all elements describe the type of data contained within. For example, in HTML and XHTML, a p (paragraph) element should contain a paragraph of text, and an h1 element should contain the highest-level header of the page. In HTML and XHTML, span and div are the only elements that carry no innate semantic meaning, besides the logical grouping of the enclosed elements.
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