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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 shortened to booting) 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.