Silent Sound Technology allows people to communicate without speaking aloud by analyzing tiny muscular movements in the face during speech using electromyography and image processing. EMG sensors detect electrical signals from articulator muscles and convert them to text or audio output, while image processing recognizes lip and facial expressions to decode silent speech. The technology aims to help those who have lost their voice communicate but has limitations like needing many sensor attachments and difficulty translating some languages. It has applications for secret communication, silent calling, and assisting those with speech disabilities.