What is Operating System

Duration: 10 min

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Inside: a video lesson and guided study material.

Module outline

  1. Numerical Ability & Problem Solving: Speed Mathematics and Basic Mathematics, Arithmetic, Number System, HCF LCM, Divisibility Rules, Percentage, Ratio and Proportion (Ratios), Average, Profit and Loss, Simple Interest and Compound Interest, Mixture and Alligation, Time and Work, Pipe and Cistern, Speed Time and Distance, Age Problems, Partnership, Data Interpretation, Mental Ability, Sequence and Series (Series), Powers and Exponents (Surds and Indices), Algebra, Statistics, Logarithm, Mensuration and Geometry, Permutation and Combination, Probability, Sequences and Series, Powers, Surds and Logarithms, Subject-Verb Agreement, Sentence Completion, Geometry, Sentence Structure and Correction, Data Sufficiency, Trigonometry, Measurement and Quantity Take-Off, Signal Space and Optimum Detection, Probability, Statistics, Algebra, Time and Work, Speed, Time and Distance, Data Interpretation, Combinatorics
  2. Logical Reasoning: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Syllogisms, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Seating Arrangements, Blood Relations, Directions (Direction Test), Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Analytical Reasoning (Counting Figures Reasoning), Puzzle Solving (Puzzles), Calendar, Clock, Cubes & Dices, Logical Sequence Of Words, Venn Diagram, Data Arrangement, Inequality, Analogy, Ranking, Order and Sequence, Selection Decision Table (Decision Making), Alphabet and Word Tests, Numerical Reasoning, Number System, Averages, Mixtures and Alligation, Percentages, Series Completion, Analogy and Classification, Patterns in Two-Dimensional Figures, Coding and Decoding, Mathematical Operations, Direction Sense, Logical Deduction and Induction, Syllogisms and Venn Diagrams, Critical Reasoning, Order, Ranking and Sequence, Reading Comprehension, Profit, Loss and Discount, Constraint Puzzles, Traverse Surveying, Ratio and Proportion, Mensuration, Permutations and Combinations, Clocks and Calendars, Assembling and Grouping of Shapes, Transformation of Shapes, Three-Dimensional Patterns and Visualization, Cubes and Dice, Vocabulary, Blood Relations
  3. General Knowledge & Current Affairs (India + Rajasthan): History, Geography, Polity, Indian Economy, Static General Knowledge, State Wise GK, GK- Current Affairs, Environment, Physics
  4. Computer Fundamentals & Operating Systems: Basics of COA, Floating Point Rep, Digital Systems & Boolean Basics, Number Representation, Number System, Introduction to OS, File Management, Windows OS, Unix OS, Linux OS, Register Transfer and Microoperations, Virtual Memory
  5. Computer Networks: Introduction to CN, Data Communication, DLL: Error Control, DLL: Access Control, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Application Layer, Hardware Basics, Network Security
  6. Cyber Security: Cyber Threats and Malware Attacks, Role of Internet and Web Services, Security in Mobile and Wireless Computing, Electronic Data Interchange and E-Commerce, Physical Security and Cryptography Basics, Intrusion Detection Systems (IDS), Cyber Safety and Security, Ethical Hacking
  7. Programming (C & OOP): C Fundamentals, Control Flow, Arrays & Pointers, Functions, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling, OOPS with C++, Operators & Expressions, Sorting Algorithms, Java Fundamentals, Java
  8. MS Office & Data Processing: MS Office Applications, Basics of DBMS
  9. Internet & Web Technology: Society, Law & Ethics, Terms & Abbreviations, Keyboard Shortcuts, Emerging Tech Trends, Artificial Intelligence, Emerging Technologies, Internet Fundamentals, Website, Browser & Services, Web Design & Development, Protocols & Services, Web Publishing & Hosting, Server Side & Security
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This lecture introduces the fundamental concept of an operating system (OS) as a core component of computer architecture. The instructor begins by defining the OS as an interface between the user and the core machine, using real-world analogies such as a car's steering wheel, a fan switch, and electronic device buttons to illustrate how an interface mediates interaction. The lecture then transitions to a formal definition, describing the OS as a program or system software that acts as an intermediary between users and hardware. A key role of the OS is presented as a resource manager or allocator, which controls and coordinates hardware resources like CPU time, memory, and system buses among various application programs. The lecture concludes by presenting an abstract view of a computer system, showing the layered architecture where hardware sits at the base, the OS acts as a platform above it, and user applications and compilers reside on top. Market share data for personal computer operating systems (Windows 82.7%, Mac 13.23%, Linux) and mobile phone operating systems (Android 87.5%, iOS 12.1%) is provided to contextualize real-world examples.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The lecture opens with a numbered agenda list on the left side of the screen, covering topics from 'What is Operating System' through 'Micro-Kernel approach' and 'System call.' The instructor introduces the core concept by displaying a slide titled 'What is Operating System,' which states that whatever is used as an interface between the user and the core machine is the OS. Real-world examples are shown, including a car steering wheel marked with red arrows, a ceiling fan next to a hand holding a remote circled in red, and a microwave oven. The instructor poses the guiding question of why an operating system is needed, answering that it enables everybody to use hardware in a convenient and efficient manner.

  2. 2:00 – 5:00 02:00-05:00

    The instructor continues explaining the interface concept using the same slide with the Ford steering wheel, ceiling fan remote, and electronic button panel. The lecture then transitions to a new slide titled 'Definition of Operating System,' which formally defines the OS as a program or system software that acts as an intermediary between the user and hardware. A cartoon boy and desktop computer are shown beside this definition. The instructor hand-draws a box labeled 'OS' with arrows connecting the user side to the computer, visually illustrating its intermediary role. This section bridges the intuitive interface analogy with a more technical software definition.

  3. 5:00 – 9:32 05:00-09:32

    The lecture introduces the OS as a 'Resource Manager/Allocator,' listing CPU time, memory, and system buses as managed resources, paired with a multi-armed manager graphic on a teal background. The slide states that the OS controls and coordinates the use of resources among various application programs. An 'Abstract View of a Computer System' is then presented, showing a layered architecture with Computer Hardware at the base, Operating System in the middle as a platform, and user applications and compilers above. The section concludes with market share examples: for personal computers, Microsoft Windows (82.7%), Mac (13.23%), and Linux; for mobile phones, Android (87.5%) and iOS (12.1%).

The lecture follows a clear pedagogical progression from intuitive analogy to formal definition to architectural role. It begins by grounding the abstract concept of an OS in familiar physical interfaces (steering wheel, fan switch), making the idea accessible before introducing technical terminology. The transition from 'interface' to 'program or system software' marks the shift from analogy to definition. The resource manager concept then explains the OS's functional purpose, while the layered architecture diagram provides a structural view of where the OS sits in the computer system. The market share data serves as a practical anchor, connecting theoretical concepts to real-world products students encounter daily. The teaching flow moves from what an OS is (interface), to how it is defined (system software), to what it does (resource management), and finally where it fits (layered architecture).

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