Synthesia is an AI video generator that uses AI avatars in place of actors or voiceovers, primarily catering to enterprise and tech businesses. It offers a range of features including massive avatar inventory, text-to-speech engine, presentation design tool, and automation capabilities through integration with Zapier. While the quality of its AI voices can be inconsistent, Synthesia's versatility and usefulness for business use still manage to surprise users. The platform is suitable for larger companies looking to scale their internal communications and training videos, but may not be ideal for high-impact presentations or marketing videos that require more polish in terms of lip syncing and facial expressions.