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What Is an Operating System?
An OS manages hardware and software resources and provides services for programs to run.
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AiTechWorlds
AiTechWorlds
An operating system manages a computer’s hardware and software resources. This visual guide explains the kernel, processes vs threads, scheduling, memory management, virtual memory, deadlocks, file systems, and system calls.
An OS manages hardware and software resources and provides services for programs to run.
The kernel is the core of the OS, controlling memory, processes, and hardware access.
A process is a running program; threads are lightweight units of execution within it.
The scheduler decides which process runs next to share the CPU fairly and efficiently.
A context switch saves one process’s state and loads another’s to share the CPU.
The OS allocates and tracks memory so programs don’t interfere with each other.
Virtual memory lets programs use more memory than physically available using disk space.
These techniques divide memory into manageable blocks for efficient allocation.
A deadlock occurs when processes wait on each other forever, none able to proceed.
Concurrency manages many tasks at once; parallelism runs them simultaneously on multiple cores.
These synchronization tools prevent multiple threads from corrupting shared data.
A file system organizes how data is stored and retrieved on disk.
A system call is how a program requests a service from the OS kernel.
User mode is restricted for apps; kernel mode has full hardware access for the OS.
The OS caches frequently used data in fast memory to speed up access.
Interrupts let hardware signal the CPU to pause and handle urgent events.
Each OS differs in design, licensing, and use cases but shares core concepts.
A shell is a program that lets you control the OS through typed commands.
Booting loads the OS into memory step by step when a computer powers on.
Understanding the OS helps you write faster, safer, and more reliable software.
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