What is the definition of array keys in data structures?

The definition of array keys in data structures refers to a set of single references that are used to uniquely identify and access values within an array. Each key acts as an index that corresponds to a specific value, allowing for efficient data retrieval.

In programming languages, arrays can be thought of as collections of elements, and the keys serve as the means to organize and access those elements. For instance, when you have an associative array, the keys might be strings that represent categories, while the values could be data points associated with those categories.

Having a set of individual references is fundamental to using arrays effectively, as it enables developers to manage data efficiently, manipulate it with ease, and ensure that operations on the data are both organized and optimized.

This understanding of array keys as individual references aligns with the principles of how data structures function, making this option the most accurate choice in the context of data structures.