[olavk]

It gives you separation of concerns between content structure and presentation. This allows you to adapt the presentation for different audiences. For example, on a phone with a small screen, you might not want a three-column layout, but just have everything in one column. You can do that with an alternative style-sheet.

Additionally, you don't have to confuse screen readers with a table which don't really contain tabular data. So it also more accessible.