What is Deep Learning?

Why'Deep Learning' is called deep? It is because of the structure of ANNs. Earlier 40 years back, neural networks were only 2 layers deep as it was not computationally feasible to build larger networks. Now it is common to have neural networks with 10 layers and even 100 layer ANNs are being tried upon. Using multiple levels of neural networks in Deep Learning, computers now have the capacity to see, learn, and react to complex situations as well or better than humans. Normally data scientists spend lot of time in data preparation – feature extraction or selecting variables which are actually useful to predictive analytics . Deep learning does this job automatically and make life easier.