When are dl, dt, and dd suitable to be used? _HTML/Xhtml_Web page production

dl: Definition list
Definition list
dt: Definition title
Definition title
dd: Definition Description
Definition description
dt is where the information title is placed, and dd is for this information A simple summary description,
That is to say, a dt corresponds to a dd to describe it
The content in the dd can be arbitrary, pictures, text or even video or audio
Multiple similar dt and dd Form a dl

then dl dt dd is suitable for performance such as: news list with summary, product list with thumbnails and other descriptions...