Chatbot

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Overview

A chatbot is a computer program designed to simulate conversation with human users, especially over the internet. Chatbots are a key application of Artificial Intelligence and Natural Language Processing, enabling automated interactions in customer service, entertainment, and information retrieval. They can range from simple rule-based systems that respond to specific keywords to advanced conversational agents powered by Machine Learning and large language models.

History

The concept of a chatbot dates back to the mid‑20th century. In 1950, Alan Turing proposed the Turing Test as a measure of machine intelligence. The first recognizable chatbot, ELIZA, was developed at MIT in the 1960s by Joseph Weizenbaum; it simulated a psychotherapist by pattern‑matching user input. Later milestones include PARRY (1972), ALICE (1995), and the rise of commercial chatbots like Siri (2011), Amazon Alexa (2014), and Google Assistant (2016). The release of ChatGPT in 2022 by OpenAI popularized large‑language‑model chatbots.

Types

• Rule‑based chatbots – Follow predefined decision trees and respond to specific commands or keywords.
• AI‑powered chatbots – Use machine learning and natural language understanding to generate responses dynamically.
• Hybrid chatbots – Combine rule‑based logic with AI for more robust handling of complex queries.

Applications

Chatbots are widely used in customer support, e‑commerce, healthcare (e.g., symptom checkers), education (tutoring bots), and entertainment (interactive fiction). They also serve as personal assistants for scheduling, reminders, and smart home control. In recent years, generative chatbots have been integrated into content creation, coding assistance, and research.

Limitations

Common challenges include misunderstanding ambiguous queries, lack of common sense, tendency to produce plausible but incorrect information (hallucination), and ethical concerns regarding privacy, bias, and misuse. Rule‑based bots are brittle, while AI bots require large training datasets and computational resources.