Firmware means a combination of software and hardware. The main task of it refers to providing the control program for a device. This program means a set of special instructions to control how a device operates. Appliances containing firmware are typically computers, mobiles, digital cameras, routers, firewalls, different kinds of consumer products.
Firmware is stored in memory devices such as ROM, EPROM, EPROMs. If you loaded the firmware into normal storage of your device, it can more easily be erased or lost, for example, in the event of a failure.
There are some firmware memory devices which are installed by the manufacturer once and for all and consequently cannot be changed. So, not every product has a firmware update. But often updating firmware is possible.
Updating firmware is needed for adding new options to the device, unlocking hidden functionality or fixing bugs. If you are going to improve the performance and reliability of your appliance, you can change firmware for it. For example, firmwares updates can include timing and control systems for some domestic electrical appliances, controlling sound and channel list for TV, etc.
You can find firmware versions for your devices on the Internet. It is a good idea to go to the official manufacturer's website. Nowadays there are also a lot of websites that offer different firmware versions. Please, choose only reliable archives resources for firmware download like Myfixbase. The website must guarantee that it is free from viruses. Anyway, you should scan the file you have downloaded for viruses.
Of course, it is not necessary to perform your firmware updates quite often. But periodical firmware update is very useful for many devices.