FileVault is a disk encryption program available on macOS that helps protect the data on your computer. It encrypts the entire startup disk, ensuring that only authorized users can access the information stored on it. This is particularly useful for safeguarding sensitive data in case your device is lost or stolen. When you enable FileVault, it requires you to set a password that unlocks the disk. If you forget this password, you may lose access to your files. Additionally, FileVault uses strong encryption algorithms to secure your data, making it difficult for unauthorized users to retrieve any information without the correct credentials.