Database is structured collection of information on specific subjects. We can think of a database as an electronic filing system.
An example of the database is a telephone book which contains records of names, addresses and contact numbers.
A database allows its contents to be easily accessed, updated, stored and retrieved.
A database is an organized collection of data, today typically in digital form. The data are typically organized to model relevant aspects of reality (for example, the availability of books in bookstores), in a way that supports processes requiring this information (for example, finding a book with prices).
The term database is correctly applied to the data and their supporting data structures, and not to the database management system (DBMS). The database data collection with DBMS is called a database system.
DATABASE MANAGEMENT SYSTEM (DBMS)
A Database management System is a program that accesses information from a database.
A Database Management System provides an interface between the database and the user.
A Database management System enables you to extract, modify and store information from a database.
Well known DBMSs include Oracle, IBM DB2, Microsoft SQL Server, Microsoft Access, PostgreSQL, MySQL, and SQLite. A database is not generally portable across different DBMS, but different DBMSs can inter-operate to some degree by using standards like SQL and ODBC together to support a single application. A DBMS also needs to provide effective run-time execution to properly support (e.g., in terms of performance, availability, and security) as many end-users as needed.
A way to classify databases involves the type of their contents, for example: bibliographic, document-text, statistical, or multimedia objects. Another way is by their application area, for example: accounting, music compositions, movies, banking, manufacturing, or insurance.
The term database may be narrowed to specify particular aspects of organized collection of data and may refer to the logical database, to the physical database as data content in computer data storage or to many other database sub-definitions.http://en.wikipedia.org/wiki/Database