生成以下单词的定义：artificial intelligence, machine learning, deep learning, neural network.


单词: artificial intelligence, machine learning, deep learning, neural network
- Artificial intelligence: A field of computer science and engineering focused on creating intelligent agents that can perform tasks that typically require human-level intelligence, such as understanding natural language, recognizing objects, and making decisions. 

- Machine learning: A subset of artificial intelligence that involves training algorithms on large datasets to learn patterns and make predictions or decisions without being explicitly programmed. 

- Deep learning: A subset of machine learning that involves training neural networks with many layers of computational nodes to learn representations of data at increasing levels of abstraction, enabling the development of highly accurate models for tasks such as image and speech recognition. 

- Neural network: A type of computational model inspired by the structure and function of biological neurons, consisting of interconnected nodes that simulate the behavior of neurons and enable the processing and classification of complex data.