tldr
An agent is a chatbot that can do things, not just say things. Imagine a really good assistant who can also click buttons.
what makes it more than a chatbot
A normal LLM (like ChatGPT in the box) just talks. An agent has tools — small programs it can run. "Send 1 USDC to this address", "fetch this URL", "post this tweet". The brain decides; the tools act.
It's like the difference between a smart friend giving you advice on the phone, and a smart friend who is sitting at your desk and can actually open the laptop.
the loop
Every conversation goes you say something → agent thinks → agent picks a tool (maybe) → tool runs → agent reads the result → agent talks to you. Repeat. That's it. There is no magic.
why this matters
Once an agent can use tools, it can do real work — book the flight, send the message, file the expense, do the trade. A chatbot tells you what to do. An agent does it.