An operating system is software that manages basic system tasks like file and memory management, process management, input/output control, and device drivers. There are two main types of operating systems: command-line interfaces like MS-DOS and early Linux, and graphical user interfaces like Xerox Alto and XeroStar. Application software has evolved from command-line programs in the 1980s to desktop applications in the 1990s to modern web and mobile apps.

1. OPERATING SYSTEM
An operating system is a software which performs all the basic
tasks like file management, memory management, process
management, handling input and output, and controlling
peripheral devices such as disk drives and printers.

2. OS TYPES
• CUI-Command User interface Ex-MS DOS,Linux in 1981
• GUI-Graphical User interface Ex-XEroAlto,XeroStar in
1973

3. Programming Language

5. Application Software Evolution

6. • Command Line
programs-
1980’s,compilers,device
drivers
• Desktop application-
1990’s,office
applications,audio and
video players,utility
programs,browsers.

7. • Web applications 21st
century,Gmail,Ymail,Yahoo,
Twitter….
• Mobile Application 21st
century,Android,windows,i
OS platform.