The <dd> element provides a description for a term within a definition list. The dd element is most commonly used with the dt and dl tags, where the dd and dt tags occur in pairs.
The following example shows a definition list, using the dl, dt and dd tags.
The Eon's, geological time.
Hadean Eon
4.6 to 3.9 billion years ago.
Archeozoic Eon
3.9 to 2.5 billion years ago.
Proterozoic Eon
2.5 billion to 540 million years ago.
Phanerozoic Eon
540 million years ago to today