Few people are aware of Sign Language. But this few also doesn’t know the Sign Language properly. We are struggling to get awareness in public but many are known of these Deaf persons, but can’t communicate with them. By this App we can learn the Sign Language and can communicate with deaf persons. DEF-ISL app was launched on 61st International Day of Deaf, By B. Venkatesham IAS, and Secretary of Telangana Tourism.