Environment variables

Environment variables are dynamic values that can affect the way running processes on a computer behave. They are part of the operating system's environment in which a process runs and can be used by applications to retrieve configuration information. Here are some key points about environment variables: 1. **Key-Value Pairs**: Environment variables are typically stored as key-value pairs (e.g., `PATH=/usr/local/bin`), where the key is the name of the variable and the value is its corresponding data.