Introduction to Operating Systems

An operating system (OS) is a program that manages computer hardware, provides a basis for application programs, and acts as an intermediary between the computer user and the computer hardware. Examples include Windows, Linux, macOS, iOS, and Android.

A computer system's basic structure includes hardware (CPU, memory, I/O devices), the operating system, system/application programs, and users. Hardware resources are managed by the OS. Application programs, like word processors or web browsers, perform specific tasks for users.

Without an OS, users would need to write explicit code to interact with hardware for every minute task, making computing tedious and difficult. The OS abstracts these complexities, allowing users to perform actions (like opening a document) easily, as it handles the communication with hardware for resource allocation, saving, and displaying information.

Key functions of an OS include acting as an interface between the user and hardware, allocating resources (CPU, memory, I/O devices) efficiently among users or processes, and managing memory and security. Different types of OS exist, such as batch, time-sharing, distributed, network, real-time, multi-programming, multiprocessing, and multitasking systems.

The primary goals of an OS are convenience and efficiency. It makes the computer system user-friendly and convenient by managing complex hardware interactions. Additionally, it ensures efficient usage of limited resources by allocating them effectively to various users and processes.