How does condensation polymerization differ from addition polymerization?

Condensation polymerization requires a catalyst, while addition polymerization does not.

Condensation polymerization releases small molecules as byproducts, while addition polymerization does not.

Condensation polymerization forms branched polymers, while addition polymerization forms linear polymers.

Condensation polymerization involves ionic mechanisms, while addition polymerization involves radical mechanisms.