NoSQL databases, as a relatively new approach to data organisation and management, arose as a response to the enormous growth of data generated through extensive use of Internet and Web 2.0 applications. Today, the term Big Data is generally used to describe this data explosion, where huge amounts of structured and unstructured data are in question. NoSQL databases show great potential in working with Big Data, especially in situations where relational data model does not fit. The aim of this paper is to present the main features of NoSQL databases that make them the first choice in Big Data management.