Final answer:
A computer commonly includes a boot disk in the form of an operating system, which is essential for starting up the system. While historically these were physical disks, modern computers tend to have the operating system pre-installed or provide a recovery partition.
Step-by-step explanation:
When you purchase a computer, it usually includes a boot disk in the form of an operating system. The term boot disk refers to a removable digital storage medium or a partition of a hard drive containing a bootable operating system (OS). When a computer starts up, it uses this bootable media to load the OS into memory, initiating the startup process.
The concept of a boot disk has evolved. In the past, computers came with a physical disk like a CD or floppy disk that was used to boot the computer.
Nowadays, most computers come with the operating system pre-installed on the hard drive, or provide a recovery partition or USB drive that can be used to restore the system or initiate a fresh installation if needed.