Artificial intelligence is classified across different operational and functional typologies. Based on capability, the standard classification includes Reactive Machines (which operate solely on current inputs without memory), Limited Memory (systems like self-driving cars that utilize historical data), Theory of Mind (hypothetical systems that understand human emotions), and Self-Aware Machines (conscious sentient AI). Alternatively, categorized by complexity and scope, types range from narrow task-specific AI to broad generative models and multimodal systems.