Cisa
In short
CISA is the United States government agency responsible for protecting national cyber defence and critical infrastructure.
In plain words
It acts as a central hub to help organisations defend against hackers. The agency monitors digital threats and provides tools to keep essential services like power and water running safely.
A simple example
If a major hospital network faces a ransomware attack, CISA provides technical guidance and alerts to help stop the spread.
Why it matters
As more services move online, the risk of large-scale digital attacks grows. CISA helps prevent chaos by securing the systems that society relies on every day.
Easy to mix up
Do not confuse it with the CIA, which focuses on intelligence and foreign spying rather than domestic cyber defence.