Oracle Database is a product, a commercial relational database developed by Oracle. It is a set of tools that allows it to efficiently and reliably store data and manipulate it. Data is stored in tables.
DB2 was introduced by Oracle in 1980.
Oracle Database in practice: Almost all applications that work with data, use for its storage and management some database. Oracle Database is one of the options to ensure the provision of data to the applications. It is mainly used for large enterprise applications and solutions. It is used by independent developers, medium-sized companies and large corporations. Oracle Database competitors include DB2, SQL Server and MySQL (Open source).