Technically speaking linux is a kernel. The kernel is the part of the operating system that acts as a middleman/translator between the hardware and the software.
Unix and Linux
linux
Software that includes an operating system as well as utilities is called an operation system package. Two examples of this type of software system are Windows and Linux.
Windows, Linux, Mac, apple operating system, sun OS
Windows is your operating system as in "System Software". Some systems have Bluetooth enabled in them. Here Bluetooth is a system software of the computer. If you want to be clever, you could say your BIOS, or DOS or Linux.
Linux is an operating system kernel. It is a portion of the software that makes up a complete operating system.
Linux is a stable operating system for using free office software such as LibreOffice. Many varieties of Linux already have LibreOffice installed by default.
Most applications are available at your distribution's repositories, however depending on the kind of distribution, you may have the option to use user-created repositories that allow you to use applications or dependencies that offer features the official packages do not have, or that the official packages are not offered due to legal issues (some distributions have a strict policy against including non-free/proprietary software in their repositories).
The OS (operating system). Examples of OSs are windows XP and Linux.
Unix and Linux
linux
Operating System, such as Windows or Linux.
Software that includes an operating system as well as utilities is called an operation system package. Two examples of this type of software system are Windows and Linux.
Windows, Linux, Mac, apple operating system, sun OS
Operating System software. Like Windows or OSX.
Linux is an operating system (ie software) and doesn't inherently have any processors (hardware)
An operating system is usually defined as a collection of software used to create a complete and usable system. By that definition, he did not create any operating system. Torvalds created the most important piece of an operating system, a kernel. The kernel he created is called Linux.