operating system
Definition:
In the simplest terms, an operating system (OS) gives people a way to communicate with computer hardware such as the motherboard, video driver, power supply, CD/DVD Drive and hard disk storage. The OS manages and coordinates activities, provides security, allocates resources and hosts applications so your computer "just works." In fact, it's what you see when you boot your computer and before you launch software.
Here's a word you may not know...
Microsoft Office
Microsoft Office is a name for a number of applications that are sold together in a bundled, often referred to as a suite. These applications are used for creating documents, spreadsheets, charts, publications, and presentations. Examples of applications included in the Microsoft Office suite are Microsoft Word, Microsoft Excel and Microsoft PowerPoint. There are several different variations of the Microsoft Office suite, each including different bundles of Microsoft applications.