API
Application Programming Interface — the doorway that lets software talk to a model over the internet. Instead of a chat window, you send a structured request ('generate this image at 16:9') and get results back programmatically. APIs are how platforms like VAR2 connect to models like Sora 2, Veo 3.1, and Suno behind one interface, and how you could automate a thousand generations in a batch. Practical relevance: API pricing is usually per token or per generation, which is exactly the compute cost a token-based creative platform passes through to you.