What is BIOS

Bios is a short version of Basic Input Output System. BIOS is basically a ROM firm's firmware that gives directions to computer boots. It is basically attached to the motherboard in a chip shape. Motherboard software is provided by the software. And it's usually EEPROM

As soon as the computer starts, the software is launched from ROM. And computer components list is made and general checks are done.
It is possible to determine which operating system is to be run from multiple disk drives and boot from it.
Apart from this, various ports of BIOS can be closed or opened. If you want to turn off the USB port

BIOS is basically a system clock cluster. The clock that we see on the computer is basically the clock. Although the computer was shut down, the BIOS clock continued. This watch is played through CMOS batteries.
BIOS will tell you through various problems of computer and through the system speaker. For example, if you do not have the necessary operating system to start the computer, then the Boot Failure will give the message. Or if the RAM is not, but will be screwed through the speaker.