A [[Denial of Service (DoS) attack>https://www.extnoc.com/managed-ddos-service]] includes many kinds of attacks all designed to disrupt services. In addition to DDoS, you can have application layer DoS, advanced persistent DoS, and DoS as a service. Companies will use DoS as a service to stress test their networks.

In short, DDoS is one type of DoS attack – however, DoS can also mean that the attacker used a single node to initiate the attack, instead of using a botnet. Both definitions are correct.
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