Instead, you have access to an install.exe or setup.exe file that loads Excel onto your hard drive. This binary executable file is readable by a computer but not by users. For example, a programmer who wanted to modify Excel's source code to make it integrate with other software her organization uses wouldn't be able to. Although that would be helpful, it's impossible and illegal. Open source developers, on the other hand, will provide the actual source code.
People improve it, people adapt it, and people fix bugs.
And this can happen at a speed that, if one is used to the slow pace of conventional software development, seems astonishing. Open source software offers additional benefits other than no cost and ability to modify code, such as Software reliability and security is improved. Intense scrutiny from the open source software developer community means that problems are discovered and fixed quickly. Software is developed quickly and continuously improved. Collaboration generally leads to faster development, and freesource code often translates into continuous improvement.