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How does FileVault encryption work on a Mac?
If you store sensitive information on your Mac, you can use FileVault encryption to protect the files from being seen or copied. For example, if you carry all your company’s financial data on your Mac laptop, losing it could allow someone to access sensitive data that might hurt your business. FileVault encodes the information stored on your Mac, so that it can’t be read unless the login password is entered.
To ensure security when you turn on FileVault, other security features are also turned on. For example, when you turn on FileVault, you need a password to log in when your Mac is in sleep, or after leaving the screen saver. After the initial startup, only users that an administrator enables to use FileVault can log in.
See alsoEncrypt Mac data with FileVault