Level1 session3 M.Walid& Omar Bounce

What operating system is this?

• Android

• Windows

• IOS

• Mac OS

What operating system is this?

• Lunix

• Windows

• IOS

• Mac OS

Which of these are Operating System?

• Lunix

• Windows

• Unix

• MS Word

Available only for programmers

• ​Open source software​

• Closed source software​

we can see its source code and we can edit and develop it

• ​Open source software​

• Closed source software​

trial programs used for limited time

• Shareware

• Freeware

• ​ Original source programs:​

free for all users

• Shareware

• Freeware

• ​ Original source programs:​

buying the original copy

• Shareware

• Freeware

• ​ Original source programs:​