What is the drawback of global variables?

Question

Accepted Answer

Global variables can lead to unexpected changes and make debugging difficult.

Global variables can be accessed and modified from any part of the code, making it difficult to track changes.
They can cause naming conflicts if multiple variables with the same name are used in different parts of the code.
Using global variables can make it harder to test and debug code, as it can be difficult to isolate the cause of errors.
They can also lead to security vulnerabilities if sensitive data is stored in global variables.
In large projects, global variables can make it harder to maintain and update code.
Example: If a global variable is used to store a user's login credentials, it can be accessed and modified by any part of the code, potentially compromising the user's security.
Example: If multiple functions use the same global variable, changes made in one function can affect the behavior of other functions.

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