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7 Common Linux Myths You Should Stop Believing
(www.howtogeek.com)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
Under EFI, each bootloader has its own folder in the EFI partition. Each of those are registered with the firmware, and one of them is designated as the default. Grub is still there, but you'll have to mash (different key for every OEM) to get to the chooser menu.