AssemblyAI is a platform that provides AI models to transcribe and understand speech. It offers a simple API that allows users to access production-ready AI models for transcription and speech understanding.

To use AssemblyAI, developers can integrate the API into their applications or services. They can convert audio files, video files, and live speech into text by making API requests. The API provides features like speaker labels, word-level timestamps, profanity filtering, custom vocabulary, and more. Developers can also leverage the Audio Intelligence models and the LeMUR framework to build AI-powered applications with voice data.