The BIOS is built-in software that contains generic code required to control the keyboard, display screens, disk drives and other functions. BIOS is placed in a nonvolatile ROM chip inside the computer, ensuring the availability of BIOS at all times and preventing accidental disk failure. The primary purpose of the BIOS is to set up hardware and further load and start an operating system. The BIOS checks every hardware connection and locates the devices, after which the operating system is loaded into computer memory.
Every motherboard manufacturer produces a different BIOS. Because different motherboards contain different hardware architectures, the BIOS needs to be customized for that particular set of hardware. When there are hardware problems, the BIOS will display a set of error codes to give the user information about the specific hardware. BIOS is also used to identify and configure the hardware in a computer such as the memory, optical drive, hard drive, CPU, etc.
Here are some common things you can do in most BIOS systems
1. Setting the system clock
2. View Amount of Memory Installed
3. Enabling and disabling certain system components
4. Selecting boot drives
5. Hardware configuration
6. Set password prompts for secured access to BIOS user interface function
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