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Also known as boot loader, bootstrap loader

thumb|GNU GRUB, a popular free-software bootloader thumb|right|Windows Boot Manager thumb|rEFInd, a popular boot manager for EFI and [[UEFI systems]] A bootloader, also spelled as boot loader or called bootstrap loader, is a computer program that is responsible for booting a computer and booting an operating system. If it also provides an interactive menu with multiple boot choices then it is often called a boot manager.