Synthesia is an artificial intelligence platform that allows users to create videos using AI-generated avatars. These avatars can speak in multiple languages and mimic human expressions, making it easier for businesses and educators to produce engaging content without the need for cameras or actors. The platform is particularly useful for creating training videos, marketing content, and personalized messages. By simply inputting text, users can generate videos that look professional and are ready for sharing, streamlining the video production process and reducing costs associated with traditional video creation methods.