GNOME and KDE.
There are several desktop environments for Linux currently in use. The most popular are GNOME and KDE.
Linux is actually installed on a lot of different platforms. Desktops, servers, routers, video game consoles, cell phones, tablets, DVRs, toasters, robots, PDAs, PMPs. Name it, there's likely a Linux port for it.
They are two completely different platforms. You can get close to in appearance of any Windows release given you have the appropriate fonts and themes, but it will never work the same way as if you did in a native Windows installation. Conversely, if you dress up Windows to look like certain Linux desktops, it will never reach the full functionality of Linux.
Two operating systems are; Windows, and Linux.
The two common designs for a desktop computer are tower desktops and table desktops. Choice between these depends on work area space availability.
The Sunnies and the Shias.
You can have two zwinky desktops open.
MySQL and SQLite these two DB are compatible with linux environment.
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grub ana LILO are the two boot loader in Linux
The two religions are the two predominant religions today: Catholicism and Protestantism.
A multiprocessor OS. Mac OS, Windows, and Linux all currently support this(as well as many others).