I need a full detail about open source software

Answer 1

Open source software is software where the code is public to the community.

Answer 2

If you need "full detail" about something, it might be a good idea, to Google it.

https://en.m.wikipedia.org/wiki/Open-source_software

Maybe the official site of that particular something you wish to know about, also contains a good deal of relevant information, verified to be true.

https://opensource.org/about
https://opensource.org/docs/osd