Dual-Booting
From Linux 101, The beginner's guide to all things Linux.
Dual-Booting is having two (or more, but the "dual" relates to two) Operating Systems installed on your computer at the same time. This allows you to pick and choose which one you wish to work in and is very common, especially for people trying Linux for the first time. It allows you to learn Linux while still falling back to Windows or whichever other OS you utilize, if necessary.
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