Deep learning is an Artificial intelligence function that imitates the working of the human brain in processing data and craeting patterns for use in decision making
or you can say
Deep learning is part of family of machine learning methods based on artificial neural networks.
as Deep learning utilizes a hierarchical level of artificial neural networks to carry out the process of machine learning
Deep is technical term. it refers to the number of layers in a neural network. A shallow network has one so called hodden layer, and a deep network has more than one