Open-source software is computer software that is available to the general public in source code form. If a person has enough knowledge about computers and computer programming, he or she can change the program's source code. The source code is like a set of directions that show the program how to operate. People change the codes so that the program will operate in a way that will meet their needs. Sometimes changing the code will make the program run faster. Or it will take problems out of the program. These problems can cause a computer program to shut down. People who change the source code of a computer program share these programs with each other on the Internet. Programmers enjoy being able to improve computer programs on their own. They enjoy being able to ask other people on the Internet for help with their programs. Working together, people can improve computer programs for the good of the group.