Router firmware is the software that controls the device and should be kept current from a trusted source.
Why it matters
This term is useful when you are comparing a plan, diagnosing a connection or explaining a network decision to someone else. Keep the definition tied to the moment you are trying to improve rather than treating it as a score on its own.
What to ask next
- Where in the network does this term apply?
- Can you measure it at the time the problem occurs?
- Which part is controlled by the home, the provider or the service?
For a practical next step, read A Cyber-Safer Home Network in Seven Checks.