Environment variables are configuration values that are stored outside of your application's code and can be accessed at runtime. They are commonly used to store sensitive information like API keys, database credentials, and other configuration details that:

• Should not be exposed in source code repositories
• Need to change between different environments (development, staging, production)
• Contain sensitive credentials or secrets
• May need to be updated without modifying code

Resources

• Docs - Expo API Routes
• Docs - Expo Environment Variables