The purpose of data encryption in communications is to safeguard sensitive information from unauthorized access. By converting data into a coded format, encryption ensures that only authorized parties with the correct keys can decrypt and access the original content. This process is vital in protecting data transmitted over insecure networks, such as the internet, from cyber attacks or eavesdropping. Encryption fosters trust in digital communications, forming the backbone of secure practices for online transactions, confidential communications, and data storage.