The concept of deep learning is becoming more and more popular and is becoming extensively used in many research areas and industries as well. One sector where deep learning has been used heavily is the Healthcare industry, where medical researchers are employing the use of deep learning algorithms to detect various cancer cells and using it in different imaging techniques. The aim of this article is to review the literature on deep learning, the basic foundation of deep learning, as well as, understand the various models available that pertains to deep learning. This study employed the use of published research papers to evaluate the various concepts and models pertaining to deep learning as well as the origin of deep learning and its main concept. This paper also discusses the various applications of deep learning and how they are employed currently. With technological improvements, both in terms of hardware and software, deep learning algorithms will be able to perform more efficiently and accurately.

Keywords : Deep Learning, Machine Learning, Artificial Intelligence, Deep Belief Network, Convolutional Neural Network, Recurrent Neural Network, Artificial Neural Networks.