AI, or artificial intelligence, refers to the simulation of human intelligence in machines. These systems are designed to perform tasks that typically require human cognitive functions, such as learning, reasoning, problem-solving, and understanding language. AI can be found in various applications, from virtual assistants like Siri and Alexa to recommendation systems used by platforms like Netflix and Amazon. There are different types of AI, including narrow AI, which is specialized for specific tasks, and general AI, which aims to perform any intellectual task that a human can do. AI technologies often rely on large datasets and algorithms to improve their performance over time, making them increasingly effective in their designated roles.