What is file encryption used for?

File encryption is used to secure data by converting it into a format that cannot be easily understood without the proper decryption key. This is achieved through mathematical algorithms that scramble the original data, making it unreadable to unauthorized users. The primary purpose of file encryption is to protect sensitive information from theft or unauthorized access, ensuring that even if data is intercepted, it cannot be accessed without the corresponding decryption mechanism.

The other choices do not accurately describe the purpose of file encryption. Compression, for instance, involves reducing file size for storage efficiency but does not enhance security. Organizing files by size involves categorization without any security implications. Lastly, deleting files relates to eliminating data rather than keeping it secure. Therefore, the choice that correctly defines the use of file encryption is the one that emphasizes the security aspect through the scrambling of data.