NTLDR in case of BIOS MBR is called boot loader. can we called it as boot manager? are these two things same?
I never seen anything like BootManager while doing R&D on BIOS MBR but it came up in EFI Boot Process.
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A boot loader or bootstrap loader is the (relatively) small software that reads the operating system kernel into memory and then passes control to it.
A boot manager is used for cases where there are multiple operating systems installed on the one computer. Its function is to ask the user to choose one of them or to take a default. Once the choice is made, the boot manager loads and executes the boot loader of that operating system.
NTLDR (abbreviation of NT loader) is the name for the Windows boot loader, launched from the volume boot record of system partition for BIOS systems. For UEFI systems it is launched by the computer's firmware from the EFI partition.
For more information see Wikipedia : Booting.