https://www.bleepingcomputer.com/news/security/new-ddos-as-a-service-platform-used-in-recent-attacks-on-hospitals/

A new DDoS-as-a-Service (DDoSaaS) platform named 'Passion' was seen used in recent attacks by pro-Russian hacktivists against medical institutions in the United States and Europe.

A DDoS (distributed denial of service) attack is when threat actors send many requests and garbage traffic to a target server to overwhelm the server and cause it to stop responding to legitimate requests.