The document provides an overview of sign language and its history. It discusses how sign language originated as a means of communication for deaf people and evolved over centuries. Key points include that sign language was formalized in the late 1700s by a French priest who developed a system of gestures and expressions. It also notes that the earliest records of sign language date back to 5th century BC Greece. The document covers basic sign language vocabulary like greetings and numbers as well as the importance of facial expressions in communication.