JavaScript global variable

In JavaScript, a global variable is accessible throughout your entire code, across all functions and scopes. You can declare it:

1. Using var outside any function:
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   var globalVar = "I'm global!";

2. Without var, let, or const (not recommended):
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   globalVar = "I'm global!";


Global variables are attached to the global object (window in browsers or global in Node.js), making them prone to accidental overwrites and hard-to-trace bugs.

Best Practice:

Limit global variables by using functions or modules to encapsulate scope and prevent pollution of the global namespace.