What role do botnets play in launching UDP DDoS attacks?

Botnets are networks of compromised computers (bots) controlled by an attacker. These bots are often infected with malware without the owners' knowledge. Attackers use botnets to generate the massive volume of UDP packets required for a DDoS attack. The distributed nature of botnets makes it difficult to trace the attack back to its source and increases the attack's scale and resilience.