Operating Systems

Operating Systems

1. Definition Helps computers run smoothly Allows multiple tasks at once User-friendly interaction

   • Main Job of OS Acts as a middleman between user and hardware Manages resources
     • Historical Context Early Computers: Single-task systems Key Games: Pong: One of the first digital computer games Pac-Man: Iconic game from 1980
       • Security Role of OS Controls access to files Keeps files secure
         • User Interfaces Graphical User Interface (GUI) Icons and visual elements for easy navigation Start Menu: Quick access to programs Desktop: Main screen area with icons Task Execution: Uses buttons and images to control apps
           • Command-Line Interface (CLI) Text-based commands Preferred by advanced users
             • Multitasking Modern OS feature allowing multiple apps simultaneously
               • Types of OS Linux Open-source, popular in security fields
                 • Mobile Operating Systems Example: Android on phones and tablets
                   • Programming Concepts in OS Function: Reusable code block Variable: Data storage, e.g., a game score Sprite Properties: Object features like visibility Creating a Sprite: Uses commands like createSprite()
                     • Security Analyst Protects computers through firewalls and security measures
                       • Hardware Physical components (CPU, memory) Managed by OS
                         • Binary Language Computer’s language (0s and 1s) OS translates commands into binary