What Are AI Agents? A Complete Guide for 2026

AI agents are transforming how businesses automate complex workflows. Unlike traditional automation tools that follow rigid rules, AI agents can reason, plan, and adapt to new situations -- making them the next evolution in enterprise software. What Is an AI Agent? An AI agent is an autonomous software entity that uses large language models (LLMs) to perceive its environment, make decisions, and take actions to achieve a goal. Think of it as a digital worker that can understand context, use tools, and complete multi-step tasks without constant human supervision.