What is open source software?

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OPEN SOURCE SOFTWARE:

Open source software is a software whose source code is available for modification by anyone. 
'Source code' is the part of software that most computer users don't ever see. It is a piece of software work that can be used to change the code of computer programmers. Programmers who have access to a computer program's source code can improve that program by adding features to it.
If a program is open - source, its source code is freely available to its users. Its users have the right to take this source code, modify it, and distribute their own versions of the program. The users also have the ability to distribute as many copies as they want. Anyone can use the program for any purpose and there are no licensing fees or other restrictions on the software.
For example, Ubuntu Linux is an open - source operating system. You can download Ubuntu, create as many copies as you want, and give them to your friends. You can install Ubuntu on any number of your computers. You can create remixes of the Ubuntu installation disc and distribute them. You can download the source code for Ubuntu and modify it, create your own customized version of that program. Open - source licenses allow you to do this.

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