gnome and kde
A Linux distribution, known as distro or flavor, is an operating system that uses the Linux Kernel. I think the most common one is Ubuntu.
useradd
Linux differs from traditional operating system primarily in the fact that most distributions are available free of cost.
Most Linux distributions are available free of charge, so they do not require q product key to install.
Some of the Linux desktop environments that are available are: Unity, Cinnamon, Gnome, Sugar, Enlightenment, Mezzo, Xfce, Xmonad, KDE, MATE, LXDE, and ROX.
This is a holding question for alternates dealing with long-obsolete Linux distributions, such as Red Hat Linux 9. Please do not split the alternates out. There is no reason to use these distributions; they no longer receive any security updates, may not run on modern hardware, and many modern Linux distributions are free.
There is no such thing as "Linux XP". If you're referring to Windows XP, then the answer is no. As far as Linux distributions, for the majority of distributions, they are free (as in freedom) and free-of-charge.
Most Linux distributions are free
1.Linux is a generic term which is a kernel and has several distributions, whereas Ubuntu is one of the Linux kernel-based distribution. 2.Linux started its journey in 1991, whereas Ubuntu took off in 2004. 3.Linux was initially predominant among servers, making it hardly user-friendly among home and office users, whereas with the advent of Ubuntu, which was available on desktop computers, now becoming more receptive and friendly with home and office users. 4.Several Linux distributions are available like Fedora, Suse, Debian and so on, whereas Ubuntu is one such desktop-based distribution based on Linux kernel. 5.Linux is based on the Linux kernel, whereas Ubuntu is based on the Linux system and is one project or distribution. 6.Linux is secure, and most of the Linux distributions do not need anti-virus to install, whereas Ubuntu, a desktop-based operating system, is super-secure among Linux distributions. 7.Some of the Linux distributions are not desktop-based and dominant among servers, whereas Ubuntu is one of the desktop-based, is more user-friendly as compared to other Linux distribution.
Many Linux distributions are intended for home users.
"Distros", or distributions.
There are many ways to categorize Linux distributions. You can categorize them by their size, whether they run on a LiveCD, whether they are provided gratis, their ancestry of other Linux distros, and the purpose the distro is meant to serve.