Encryption and decryption work together to secure communication by converting readable data into a coded format and then back into its original form. Encryption transforms plaintext into ciphertext, making it unintelligible to unauthorized users. The secure exchange of information relies on encryption keys that dictate the conversion process. Decryption is the reverse process, utilizing the appropriate key to convert ciphertext back into plaintext. This dual process ensures that sensitive information remains confidential and accessible only to intended recipients, fostering trust in digital communication.