I need help understanding the concept of deep learning. Please provide a concise explanation. Your response should contain at least 3 sentences. Your answer must contain a title, wrapped in double angular brackets, such as <<Understanding Deep Learning>>. In your response, the word "neural" should appear at least 3 times. Highlight at least 2 sections in your answer with markdown, i.e. *highlighted section*. At the end of your response, please explicitly add a postscript starting with P.S.

user