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What is the importance of BIOS?

The significance of BIOS (Basic Input Output System)

During startup, hardware components are initialized and tested.

Finds the operating system and loads it.

Users can adjust system parameters such as boot order and performance tweaking through hardware configuration.

Offers necessary drivers to guarantee hardware functionality prior to OS loading.

Prevents unwanted access with technologies like Secure Boot (in UEFI) and BIOS passwords.