OPTIONAL
The concept of a database is some means of storing data of different types and for a variety of use cases.
You can think of them as big bank vaults that store data instead of money. Some old examples of physical databases are: Phone books (Instead of having to memorize phone numbers you can query from the book), or Physical spreadsheets/filing cabinets. These are outdated methods and were improved as technology improved.
For example:
Old Style:
Flip through the pages through a phone book until you find the requested number (If any).