a usually large collection of data organized especially for rapid search and retrieval (as by a computer)
Think of a database as a warehouse where information is stored. You have to go to the right database to find certain types of information. For example, you wouldn’t go to a tire warehouse if you want to buy furniture for your home.
Databases contain different types of sources of information such as scholarly journals articles, magazine and newspaper articles, e-books, and more. Read the database's description to gain an idea about it's contents.