A global variable is a variable that is available throughout the entire program. Global variables are generally declared at the beginning of the program and are often used to store information that needs to be accessed by multiple functions or objects. One advantage of global variables is that they allow information to be shared between different parts of the program without passing parameters. However, global variables can also lead to problems if not used correctly. For example, if two different parts of the program try to update the same global variable, it can lead to unexpected results. Therefore, using global variables sparingly and only when necessary is essential.
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