Final answer:
Encrypting an SD card makes the files become inaccessible unless decrypted with the correct key.
Step-by-step explanation:
When you encrypt your SD card, the files on the SD card become inaccessible to anyone who does not have the encryption key. Encryption is a security measure that scrambles the data contained on the SD card so that it can only be read by someone with the correct decryption key (typically a password or a special file). The encrypted files are not permanently deleted, nor are they compressed or left unchanged; they are simply encoded in such a way that they cannot be understood without being decrypted first.