Developed by NVIDIA and the American Society for Deaf Children, a new AI-driven website known as Signs invites people to learn how to sign.

American sign language (ASL) is a visual language using hand gestures, facial expressions, and body movements, primarily used by the Deaf community in North America.

ASL Pro is a free tool with a wealth of quizzes, fingerspelling practices, and a super detailed dictionary complete with video examples for learning how to sign hundreds of words.

NPR's Ailsa Chang speaks with Amanda Morris about how sign language evolves over time, the subject of her recent piece in The New York Times.