サーバーに処理しきれない大量のデータを送りつけることで過負荷をかけ、サービスを停止させる攻撃です。複数の端末から攻撃する「DDoS攻撃」もあります。
DoS attack
This is an attack that overloads the server by sending a large amount of data that it cannot process, causing the service to stop. There is also a “DDoS attack” that attacks from multiple devices.