Claude is an AI assistant built by Anthropic. You talk to it in plain language, in a chat, and it helps you write, summarise, analyse, plan, and build. Under the hood it runs on a model: Claude is the assistant you actually use, the model is the engine inside it.
Claude comes in a few models and on several plans, from a free tier to business ones. What makes it useful at work is simple: give it context and a clear ask, and it does the heavy lifting while you keep the final say.