Synthesia is an AI video generation platform specializing in the creation of synthetic presenter videos, where a photorealistic AI avatar delivers spoken content driven by a text script and synthesized voice. The platform is primarily used for corporate training, internal communications, marketing explainers, and educational content, enabling organizations to produce professional-quality talking-head video at scale without cameras, studios, or live presenters.

The Synthesia workflow allows users to select from a library of pre-built AI avatars, input a text script, choose or customize a voice, and generate a video in which the avatar delivers the script with synchronized lip movement, natural facial expression, and appropriate body language. Custom avatar creation allows organizations to build a synthetic version of a specific person or branded character for consistent use across all generated content. Synthesia supports multiple languages and accents, making it particularly useful for global communications that require content localization without re-shooting with human presenters. The platform integrates with slide-based presentation tools to produce combined presenter-and-slide videos similar to screencasts or corporate training modules. As an enterprise-focused platform, Synthesia has built a significant commercial presence in the digital learning and internal communications market.

Synthesia represents the maturation of AI synthetic media for professional business communication, demonstrating that AI avatar video has moved from a novelty into a practical production tool for organizations with high-volume video content needs. Its approach of separating the visual presenter layer from the scripted content layer has influenced how subsequent platforms have approached enterprise synthetic media generation.