Artificial intelligence (AI) is a branch of computer science that aims to create systems capable of performing tasks that normally require human intelligence. These tasks include learning from experience, reasoning and problem-solving, understanding natural language, recognizing patterns, and making decisions.

AI can be categorized into two main types: narrow AI and general AI. Narrow AI, the most common form currently in use, is designed to perform specific tasks, such as voice recognition, image classification, and playing games. General AI, on the other hand, refers to a theoretical form of AI that has the ability to understand, learn, and apply knowledge across a wide range of tasks, similar to human cognitive abilities.

AI employs various techniques and algorithms, including machine learning, deep learning, natural language processing, and expert systems. Machine learning enables AI systems to learn and improve from data without being explicitly programmed, while deep learning is a subset of machine learning that uses neural networks to analyze complex data patterns.

Overall, AI has numerous applications across various fields, including healthcare, finance, transportation, and entertainment, and continues to evolve rapidly, promising significant advancements in technology and society.