Plaintext refers to information or data that is in a readable and understandable format without any encryption or encoding applied. Unlike ciphertext, which is protected through cryptographic methods, plaintext can be easily accessed and interpreted by anyone who has access to it. In cybersecurity, it is important to protect sensitive data from being stored or transmitted as plaintext to prevent unauthorized access or data breaches. Encryption transforms plaintext into ciphertext, ensuring data confidentiality during storage or transmission.