What is DDoS (Distributed Denial of service)?

A distributed denial-of-service (DDoS) attack implies that hackers have endeavored to create a website unavailable by crashing the website with an excessive amount of traffic.
Distributed denial-of-service attacks target sites and online services. The objective is to overwhelm them with more traffic than the network can administer. The objective is to render the website inoperable.
The traffic can comprise incoming messages, demands for associations, fake packets.