Online marketing is a component of electronic commerce. Internet marketing can include information management, public relations, customer service, and sales. Electronic commerce and Internet marketing have become popular as Internet access is becoming more widely available and used. Well over one third of consumers who have Internet access in their homes report using the Internet to make purchases.

Source: wikipedia.org

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An operating system (OS) is a computer program that manages the hardware and software resources of a computer. An operating system rationally processes electronic devices in response to approved commands. At the foundation of all system software, an operating system performs basic tasks such as controlling and allocating memory, prioritizing system requests, controlling input and output devices, facilitating networking, and managing files. It also may provide a graphical user interface for higher level functions. It forms a platform for other system software and for application software.

Source: wikipedia.org