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Operating Systems (OS) is that manages hardware, software resources, and provides common services for computer programs.

Time-sharing operating systems schedule tasks for efficient use of the system and should also include accounting software for cost allocation of processor time, mass storage, printing, and other resources.

For hardware functions like input and output and memory allocation, the OS acts as an intermediary between programs and therefore the hardware, although the appliance code is typically executed directly by the hardware and regularly makes system calls to an OS function or is interrupted by it. Operating systems are found on many devices that contain a computer – from cellular phones and computer game consoles to web servers and supercomputers.

The dominant general-purpose[3] desktop OS is Microsoft Windows with a market share of around 76.45%. macOS by Apple Inc. is in second place (17.72%), and therefore the sorts of Linux are collectively in third place (1.73%).[4] within the mobile sector (including smartphones and tablets), Android’s share is up to 72% within the year 2020.[5] consistent with third-quarter 2016 data, Android’s share on smartphones is dominant with 87.5 percent with also a rate of growth of 10.3 percent per annum, followed by Apple’s iOS with 12.1 percent with a per annum decrease in market share of 5.2 percent, while other operating systems amount to only 0.3 percent.[6] Linux distributions are dominant within the server and supercomputing sectors. Other specialized classes of operating systems (special-purpose operating systems)[7][8]), like embedded and real-time systems, exist for several applications. Security-focused operating systems also exist. Some operating systems have low system requirements (i.e. light-weight Linux distribution). Others may have higher system requirements.

Some (OS) require installation or may come pre-installed with purchased computers (OEM-installation), whereas others may run directly from media (i.e. live cd) or non-volatile storage (i.e. USB stick).

The office is produced in several versions targeted towards different end-users and computing environments. the first, and most generally used version, is that the desktop version, available for PCs running the Windows and macOS operating systems. Microsoft also maintains mobile apps for Android and iOS. Office on the online may be a version of the software that runs within an internet browser.

Since Office 2013, Microsoft has promoted Office 365 because the primary means of obtaining Microsoft Office: it allows the utilization of the software and other services on a subscription business model, and users receive feature updates to the software for the lifetime of the subscription, including new features and cloud computing integration that aren’t necessarily included within the “on-premises” releases of Office sold under conventional license terms. In 2017, revenue from Office 365 overtook conventional license sales.