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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.
In general, bootstrapping usually refers to a self-starting process that is supposed to proceed without external input. In computer technology the term usually refers to the process of loading the basic software into the memory of a computer after power-on or general reset, especially the operating system which will then take care of loading other software as needed. The term appears to have originated in the early 19th-century United States to mean an absurdly impossible action, an adynaton.