Rosetta Stone Language Learning is proprietary computer-assisted language learning (CALL) software published by Rosetta Stone Inc. The software uses images, text, and sound to teach words and grammar by spaced repetition, without translation. Rosetta Stone calls its approach Dynamic Immersion (a term which it has trademarked).The software's title and logo allude to the Rosetta Stone, an ancient stone slab on which the Decree of Memphis is inscribed in three writing systems.