ChatGPT Plugins were an early version of the tool-calling idea now common across AI products. Instead of only generating text, ChatGPT could connect to third-party services, retrieve current information, and perform narrow actions through approved integrations.
That matters because the jump from chat to action changes the risk profile. A model that can search, book, calculate, or update another service needs clearer permissions, better source handling, and more user awareness than a model that only writes paragraphs.
For learners: plugins are a useful way to understand modern agents. The core question is always the same: what tool can the AI use, what data can it see, and what action is it allowed to take?