Deep learning is a subfield of machine learning that uses artificial neural networks with many layers to learn from large amounts of data. Deep learning algorithms can automatically identify and extract features from raw data, such as images, audio, and text, without the need for human input. By training on massive datasets, deep learning models can achieve high levels of accuracy in tasks such as image and speech recognition, natural language processing, and predictive analytics. Deep learning has applications in many industries, including healthcare, finance, and self-driving cars. The development of deep learning has led to significant advances in the field of artificial intelligence in recent years.