Launch
What is Environment Variable?
A value stored outside your code, like an API key or database URL. Your code reads it at runtime so secrets never get committed to a repository.
Learn this term every day on iPhone.
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In real work
Store the Stripe secret key as an environment variable. Never hardcode it. Reference it as process.env.STRIPE_SECRET_KEY.
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Google gives a definition. Prompthaus pairs each term with how it shows up in standups, PRs, prompts, and design reviews—then quizzes you until the word sticks. One term a day on iPhone.