What do you call loops that are organized in layers, with one loop inside another?

The term used to describe loops organized in layers, with one loop placed inside another, is known as nested loops. This structure allows for iteration over multiple dimensions, often seen in scenarios like processing multi-dimensional arrays or performing operations that require multiple levels of looping.

Nested loops function by executing the inner loop completely for each iteration of the outer loop. This can be particularly useful when working with data structures like matrices, where one loop manages the rows and another loop manages the columns.

In essence, nested loops enable more complex and nuanced operations by allowing for the execution of loops within loops, leading to powerful programming techniques in scenarios that require repeated tasks at several levels.