The Basic Input/Output System (BIOS) is firmware installed on the motherboard used for hardware initialization during the boot-up process and provides runtime services for operating systems and programs. To reset the boot order on a computer, a technician would access the BIOS setup utility. This utility allows the modification of the sequence in which the hardware storage devices are read by the computer during boot-up.
Reference: Understanding BIOS and its role in system boot processes is a fundamental topic in IT, especially covered in CompTIA A+ and IT Fundamentals certifications.