Here's why:

* Deoxyribose is a five-carbon sugar that forms the backbone of the DNA molecule.

* Ribose is the sugar found in RNA.

The difference between deoxyribose and ribose lies in the presence of a hydroxyl group (-OH) on the 2' carbon of ribose. Deoxyribose lacks this hydroxyl group, hence the prefix "deoxy." This structural difference makes DNA more stable than RNA, which is crucial for the long-term storage of genetic information.