What is a .env file and why is it needed?

.env file — is a text file that stores environment variables for an application. It typically contains confidential or configurable parameters such as API keys, database settings, ports, and other parameters that should not be hardcoded in the code.

Why is the .env file needed:

• Allows separation of configuration from code.
• Simplifies changing settings without modifying the source code.
• Helps keep secrets out of the repository (usually added to .gitignore).
• Provides convenience for different environments (development, testing, production).

Example content of a .env file:

API_KEY=123456789abcdef
DB_HOST=localhost
PORT=3000

In code, these variables can be accessed via process.env.API_KEY (in Node.js) or similar mechanisms in other environments.