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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.
Splash screen. Alternatively referred to as a boot screen, boot skin, or welcome screen. The splash screen is an introduction page that is displayed as a program or computer is loading or booting. For example, when a Microsoft Windows computer is starting up, there is a Windows splash screen that is displayed while Windows is loading. Typically the splash screen can include a logo or other image, as well as a company name, and sometimes the company's slogan. In the picture below, is an example of what the BIOS splash screen for a Dell computer that appears when the computer is booting.