Environment Variables Are Like Variables In Programming Languages—they Hold Data To Be Referred To By The Variable Name. Environment Variables Differ From Programs' Internal Variables In That They're Part Of The Environment Of A Program - And Other Programs - Such As The Shell - Can Modify This Environment.

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1. Environment Variables Are Like Variables In Programming Languages—they Hold Data To Be Referred To By The Variable Name. Environment Variables Differ From Programs' Internal Variables In That They're Part Of The Environment Of A Program - And Other Programs - Such As The Shell - Can Modify This Environment.