What is Deep Learning?

Deep learning is a class of machine learning algorithms that use a cascade of multiple layers of nonlinear processing units for feature extraction and transformation. Each successive layer uses the output from the previous layer as input.

Why Deep Learning?

Deep learning allows the machine to analyze the information and extract the features by itself instead of determining by a human. In contrary, other machine learning models such as logistic regression model require the user to determine the key features before running the model.
Machine Learning vs Deep Learning