# What is AI Agent? Definition & Technical Mechanics

> **Source:** [SPIDITS AI AI Glossary](https://spidits.com/ai-glossary)  
> **Category:** Agentic Systems  
> **Canonical Citation:** [https://spidits.com/ai-glossary/ai-agent](https://spidits.com/ai-glossary/ai-agent)

## Definition
An AI Agent is an autonomous entity that perceives its environment through sensors (or inputs) and acts upon that environment using actuators (or tools) to achieve specific goals. An agent relies on a reasoning brain (typically an LLM) to plan and execute multi-step processes.

## Architectural Mechanics & Deep Dive
An AI agent is a software entity that uses a cognitive foundation (typically a Large Language Model) to interact autonomously with its environment. Unlike static chatbots, an AI agent maintains state, constructs plans, delegates sub-tasks, and invokes tools (such as databases, web browsers, or calculators). By operating inside a continuous reasoning loop, the agent evaluates the outcomes of its actions against its high-level goal, dynamically adjusting its next steps until the goal is successfully accomplished.

## Industry Applications & Real-World Use Cases
Autonomous operations, customer support agents, and automated software developers

## Frequently Asked Questions

### What is the difference between an AI Agent and a chatbot?
A chatbot replies to inputs based on static patterns or one-off prompts. An AI Agent can plan actions, delegate sub-tasks, run code, read files, and work towards a goal over multiple cycles.

### What is planning in AI Agents?
Planning is the stage where the agent breaks a complex instruction into a checklist of sub-tasks and reviews its plan before execution.

## Related Terminology
- [agentic-ai](https://spidits.com/ai-glossary/agentic-ai)
- [cognitive-architecture](https://spidits.com/ai-glossary/cognitive-architecture)
- [loop-engineering](https://spidits.com/ai-glossary/loop-engineering)

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*From the SPIDITS AI Knowledge Base (300+ terms indexed). Explore full technical definitions: [https://spidits.com/ai-glossary](https://spidits.com/ai-glossary)*