TL;DR
Firmware is the embedded software permanently stored on a device's control board that runs its hardware — the code that tells a washer's main board how to sequence a cycle, a thermostat how to stage heat, or a router how to handle traffic. It occupies the layer between bare electronics and any user-facing apps, and manufacturers revise it to fix bugs and add features.
What it means
Firmware is the embedded software permanently stored on a device's control board that runs its hardware — the code that tells a washer's main board how to sequence a cycle, a thermostat how to stage heat, or a router how to handle traffic. It occupies the layer between bare electronics and any user-facing apps, and manufacturers revise it to fix bugs and add features. Mismatched or corrupted firmware after a board replacement is a classic cause of an appliance that powers up but behaves strangely.
Where it sits in the glossary
Firmware is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
License: CC-BY-4.0 — quote freely with attribution to ProFix Editorial Team / ProFix Directory.