While neural networks are responsible for recent breakthroughs in problems like computer vision, machine translation and time series prediction — they can also combine with reinforcement learning algorithms to create something astounding like AlphaGo. Deep reinforcement learning (DRL) is a machine learning method that extends reinforcement learning approach using deep learning techniques. Recent advances in Deep learning area has also fueled in Reinforcement learning as it doesn’t need hand-engineered features any more because of this ability. After appropriate many backpropagations, deep neural network knows which information is important to do the task.