Deep Learning (DL) is a sub-field of Machine Learning. Deep Learning uses neural networks to analyse large data sets. The structure of the artificial neural networks is inspired by biological neural networks. Thus, by using neural networks, human behaviour, such as reasoning from information, can be imitated.
A neural network has the advantage that much larger mountains of data can be examined much faster than humans ever could. Thus, neural networks are used wherever patterns or trends in large amounts of data are examined, for example in face, object or speech recognition. During the use of a neural network, it learns from the input data and improves its performance (self-learning system).