Integrating proper structure on your pages makes it easier for people using screen readers.
Do not use structural elements outside of their intended purpose. For example, using table elements for layout to create columns can confuse individuals relying on screen reading software. The screen reader will announce the structure of a table, and users may believe they are navigating through tabular data when they are not.
The screenshot right shows the table tool in the NYU.edu CMS. The Advanced tab provides the option of setting a column or row, or both, as table headers.
Use an inspection tool, like the Web Developer Toolbar, to display structural elements: