Big Data and Data Science are interconnected, yet they are not equal in meaning. By its concept, Big Data designates all data types, characterized by volume, variety and velocity, which are extracted from different sources and require special systems & modeling techniques to process them efficiently. Data Science is, in turn, a set of scientific activities applied to process big data for specific business goals, which requires expertise in a number of fields, like mathematics, computer science, statistics, artificial intelligence, etc. We can say that the Data Science concept has originated from Big Data.