The book "A DNA-based Cryptography and Steganography Technique" offers an innovative perspective on the integration of cryptography and steganography through the simulation of biological processes. It presents a novel algorithm that mimics the mechanisms of DNA transcription, splicing, and RNA translation to enable secure communication between sender and receiver. This method protects the transmitted information from unauthorized access by making it impossible for third parties to decrypt or understand the content of the messages. The book analyzes the advantages and disadvantages of the proposed algorithm and compares it with existing encryption techniques to assess its effectiveness and security. It is aimed at professionals and students in the fields of technology and IT who are interested in modern approaches to data security.