What is Operating System

Duration: 10 min

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Inside: a video lesson and guided study material.

Module outline

  1. English Comprehension/Verbal Ability: Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Vocabulary, Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Subject Verb Agreement (Verb Noun Agreement), Tenses, Verb, Articles, Preposition, Conjunction, Pronoun, Noun, Adjectives, Adverb, Modals, Cloze Test (Cloze Passage), Active Passive Voice (Voice), Direct and Indirect Speech, Sentence Construction
  2. Logical Ability: Coding Decoding, Directions (Direction Test), Analogy, Inequality, Data Sufficiency, Series (Number and Letter Series) (Numerical Relations and Reasoning), Syllogisms, Seating Arrangements, Puzzle Solving (Puzzles), Blood Relations, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Ranking, Order and Sequence, Logical Sequence Of Words, Data Arrangement, Venn Diagram, Calendar, Clock
  3. Quantitative Ability: Logarithm, Permutation and Combination, Probability, Profit and Loss, Speed Time and Distance, Mixture and Alligation, Partnership, Simple Interest and Compound Interest, Percentage, Ratio and Proportion (Ratios), Average, Time and Work, Pipe and Cistern, Number System, Divisibility Rules, HCF LCM, Algebra, Powers and Exponents (Surds and Indices), Mensuration and Geometry, Age Problems, Data Interpretation, Sequence and Series (Series)
  4. Basic Analytical Ability: Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Analytical Reasoning (Counting Figures Reasoning), Cubes & Dices, Selection Decision Table (Decision Making)
  5. Computer Programming: Pseudo Codes, Coding Questions by Yash Sir, C Programming by Yash Sir, Programming in C++, Java, Python for Placements by Yash Sir
  6. DBMS (Computer Science): Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Transaction Management, Concurrency Control, Database Security & Authorization
  7. SQL (Computer Science): SQL
  8. OS (Computer Science): Introduction to OS, Process Management, CPU Scheduling, Deadlock, Process Synchronization, Threads & Process Creation, Memory Management, Virtual Memory, File Management
  9. Computer Networks (Computer Science): Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Security
  10. Data Structures (Computer Science): Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  11. OOPs (Computer Science): Object Oriented Programming (OOPS)
  12. Software Engineering (Computer Science): Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  13. SVAR Conversational - Spoken English: Communication Assessment
  14. HR Interview: MR & HR Interview Preparation
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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