I've seen the phrase "firmware update" a few places before. Why and how do I update it? What changes are made to my computer?
EDIT: I originally wrote "what it firmware?" but I'll save someone the trouble of posting the wikipedia article
...and people update it because:
Seriously, this information is in the Wikipedia article itself. What exactly do you want by asking about firmwares? "How do you update", depends on the device you want to update. Each eletronic device has specific procedures to do it.
In computing, firmware is software that is embedded in a hardware device. It is often provided on flash ROMs or as a binary image file that can be uploaded onto existing hardware by a user.
Firmware is defined as:
Source: Federal Standard 1037C.
In practical terms, firmware updates can improve the performance and reliability, indeed even the basic available functionality of a device, and many devices benefit from regular firmware updates. One of the most common devices to have regular firmware updates are recording devices such as optical media writers (DVD, CD, Bluray), as media technologies extend, so firmware updates ensure hardware is kept up to date and compatible.