System Calls & Modes in Operating System Explained | OS for Beginners | 5th Sem IPU

In this video, we continue our Operating System series by covering System Calls and the Modes of Operation (User Mode and Kernel Mode), two topics that are asked in almost every OS exam. You'll learn: ✅ What a system call is and why programs need it ✅ How a user program asks the OS for services (like fork(), read(), write()) ✅ User Mode vs Kernel Mode, and why the OS uses two modes ✅ How the switch from user mode to kernel mode happens during a system call ✅ Types of system calls (process control, file management, device management, information and communication) This is a beginner-friendly explanation with simple examples, useful whether you're starting your OS preparation or revising for exams. #OperatingSystem #OS #SystemCalls #UserMode #KernelMode #OSForBeginners #5thSemIPU #ComputerScience #bca #bca5sem