It’s a tool that lets anyone create and deploy functional software (usually web-based) by writing prompts in plain English. Usually they are UI “wrappers” for leading AI models (usually Claude). The platforms also usually include online development environments and integrations (for databases, etc).

Examples include Bolt.new, lovable, mgx.dev, google AI studio... Vercel and Replit also have popular platforms. Google AI studio also counts, here. There are probably dozens more.