Relational Database

Topics discussed in the paper should address the following questions:

What is a relational database?
What is the role of the relational database in an organization today?
What are the main functions of the Relational Database Management System (RDBMS)? List at least five functions.
What other types of databases exist today on the market?
What is the fundamental difference between NoSQL and a relational database?
What is the role of a relational database in the Big Data ecosystem?
In your opinion, what is the future for relational databases? Explain your reasoning.