How Simple Traffic Jams Break Digital Servers
A denial-of-service attack works like a massive, intentional traffic jam. By flooding a website with an avalanche of fake requests, attackers make it impossible for real users to connect, effectively locking them out of the digital storefront.
Imagine thousands of people rushing into a small shop at once just to stand still and block the aisles. That is exactly how this digital blockade functions by overwhelming a server until it crashes under the pressure. These attacks can be launched from a single machine or, more dangerously, from an army of compromised devices worldwide. It is a persistent threat because it does not actually hack into your data, but rather simply breaks the door so no one can enter.
Source: Denial-of-service attack