An early chat program using pattern matching and set replies.
ELIZA is like a school nurse with a clipboard. You say, “I feel stressed,” and it says, “Why do you feel stressed?”
It helps explain early chat systems. It shows a good reply is not real understanding.
Chatbot
ELIZA was an early chatbot and showed how easily chat can feel human.
NLP
ELIZA used simple rules to handle human language input.
Symbolic AI
ELIZA used hand-written rules and pattern matching to fake a chat.
Turing-test
ELIZA shows a key lesson: replying well is not understanding.