What is Deep Learning and why it is getting so much hype?

If a list is made about one of the most sought after technologies in the 21st century,Deep Learning would be surely at the top percentile of the list but what actually is Deep Learning? Deep Learning can be said to be a subset of Machine Learning.The main objective of Deep Learning is to replicate the intelligence of a human brain.It does the job by the use of various types of artificial neural networks.The neural networks can be assumed as a mathematical replication of biological nervous system. Perceptron and neuron(fundamental units of neural network and human brain) and how similar are they? Perceptron(a single layer neural network)is formed on the basis of a neuron(neurons are the fundamental units of a human brain). These are the final and important components that help to determine whether the neuron will fire/activate or not.It is implemented on the summation function and gives a final output(depends on the type of activation function) which will be forwarded to the next layer/perceptron.