These are very useful for categories with items within each category, which need indentation. First enclose the entire definition list with DL and /DL tags. Then use the DT tag for each category and the DD tag for each sub-item with each category. For example:

First Category

First item of first categosy

Second itemFirst sub-item of first categosy

Second Category

Only item within this category

Third Category

First item of third category

Second item of third category