(general) A collection of (usually) organized information in a regular structure, usually but not necessarily in a machine-readable format accessible by a computer.
I have a database of all my contacts in my personal organizer.
A set of tables in a database(1).
The "books" database will have three tables, and the "customers" database will have two tables.
A software program for storing, retrieving and manipulating a database(1).
Which database do you use: MySQL or Oracle?
A combination of (1) and (2).
To enter data into a database.