The purpose of data encryption in cybersecurity is to protect sensitive information from unauthorized access and breaches. By transforming readable data into an unreadable format using encryption algorithms, it ensures that only authorized users with the proper decryption keys can access the original data. This process enhances privacy and integrity, safeguarding communication over networks and storing information securely. Data encryption is crucial in various domains, including financial transactions, health records, and personal data, thereby maintaining trust in digital interactions.