Here's a short story:

Linux is a name which broadly denotes a family of free and open-source software operating system distributions built around the Linux kernel. The defining component of a Linux distribution is the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Many Linux distributions use the word "Linux" in their name. The Free Software Foundation uses the name "GNU/Linux" to refer to the operating system family, as well as specific distributions, to emphasize that most Linux distributions are not just the Linux kernel, and that they have in common not only the kernel, but also numerous utilities and libraries, a large proportion of which are from the GNU project. This has led to some controversy. 

Linux was originally developed for personal computers based on the Intel x86 architecture, but has since been ported to more platforms than any other operating system. Because of the dominance of the Linux kernel-based Android OS on smartphones, Linux has the largest installed base of all general-purpose operating systems. Linux is also the leading operating system on servers and other big iron systems such as mainframe computers, and is used on 99.6% of the TOP500 supercomputers. It is used by around 2.3% of desktop computers. The Chromebook, which runs the Linux kernel-based Chrome OS, dominates the US K–12 education market and represents nearly 20% of the sub-$300 notebook sales in the US. Linux also runs on embedded systems – devices whose operating system is typically built into the firmware and is highly tailored to the system. This includes TiVo and similar DVR devices, network routers, facility automation controls, televisions, video game consoles and smartwatches. Many smartphones and tablet computers run Android and other Linux derivatives. (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: When was the Linux kernel released?
Guess: September 17, 1991

Question: By whom?
Guess: Linus Torvalds

Question: True or False: Most Linux distributions are just the kernel.
Guess: false

Question: What is something many Linux distributions share?
Guess: use of the word "Linux" in their name

Question: Do they also share libraries?
Guess: yes

Question: Where do many of those come from?
Guess: GNU project

Question: What organization uses the GNU name?
Guess: TiVo

Question: Does the Chromebook use something from Linux?
Guess: yes

Question: What?
Guess: Chrome OS

Question: What market does it lead?
Guess: US K–12 education

Question: Does the Chromebook cost less than three hundred dollars?
Guess: yes

Question: What percentage of notebooks sold for less than three hundred are Chromebooks?
Guess: nearly 20%

Question: What was Linux first made for?
Guess: personal computers

Question: What structure was it based on?
Guess: Intel x86

Question: Is it on phones now?
Guess: yes

Now answer the following question in the same format.

Question: What kind?

smartphones