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Theory:

The operating system and application software are available in two forms. They are,

  1. Free and Open source
  2. Paid and Proprietary Software
Free and Open-source Software:
Free and Open-source Software is a software that is freely licensed to use, copy, study, and change the software in any way, and the source code is openly shared so that the users are encouraged to voluntarily improve the design of the software.
    Example:
  • Linux
  • Python
  • VLC Media Player
  • Blender
  • Mozilla Firefox
  • Open office
  • GeoGebra, etc.
open-source.jpg
Examples - Free and Open-source Software
  
Paid and Proprietary Software:
 
Paid and Proprietary Software is also known as “Closed Source” is different to open source. Instead of being free for anyone to use, Paid and proprietary software is owned by an individual or company. The source code is usually kept secret. The license of the software would not be provided unless it is purchased. This means only people with access to the code can modify and change it. Similarly, the end users are legally prohibited to steal the software program or to use the pirated version of the Paid and Proprietary Software.
Example:
  • Windows
  • macOS
  • Microsoft Office
  • Adobe Photoshop
  • iTunes
  • Skype
  • Zoom
  • WinRAR
 
Examples-of-closed-source-software.png
Examples - Paid and Proprietary Software (Closed Source)
 
1_Pp1Co-0vbzphCt_wzmeI9A.png
Closed Source Vs Open Source
Important!

Note: The Open Source Initiative (OSI) is an organization dedicated to promote Open Source Software.

Reference:
https://mlperocho.files.wordpress.com/2014/09/open-source.jpg
https://images.uncyclomedia.co/illogicopedia/en/f/f6/Examples-of-closed-source-software.png
https://medium.com/@mcccccc/is-open-source-software-more-reliable-or-secure-than-closed-source-software-5470732d7b90