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A bootsplash, also known as a bootscreen, is a term for a graphical representation of the boot process of the operating system. A bootsplash can be a simple visualisation of the scrolling boot messages in the console, but it can also present graphics or some combinations of both.
A boot loader, also called a boot manager, is a small program that places the operating system (OS) of a computer into memory. When a computer is powered-up or restarted, the basic input/output system (BIOS) performs some initial tests, and then transfers control to the the master boot record (MBR) where the boot loader resides.