In my opinion, data science is finding right quesitons, anwering questions, solving problems, taking actions or making decisions based on analyzing related data. It is basically quantitivative or data-driven problem-solving discipline. That's why it is so important in our current century. 

One thing we should bear in mind is that data science not only focuses on answering a specific question as the normal analytics will do, but also focuses on finding the right question to answer. That's why we have the word "science" in this term.