A database index is a data structure that improves the speed of data retrieval operations on a database table at the cost of additional writes and storage space to maintain the index data structure.

What is an example of indexing?

Index is defined as to categorize or list, or to make adjustments automatically based on a particular changing statistic. An example of index is to put employees names in alphabetical order.

What does it mean for something to be indexed?

If a quantity or value is indexed to another, a system is arranged so that it increases or decreases whenever the other one increases or decreases.