Jagged arrays are multidimensional arrays where each row of the array can have a different number of elements. In contrast to regular multidimensional arrays, where each row has the same number of elements, jagged arrays allow for more flexibility in terms of data storage. Jagged arrays can be used in situations where the size of the data being stored is unknown or where the data varies in size.

For example, let's say we want to store data about a group of students, where each student has a different number of grades in different subjects. We could use a jagged array to store this data, with each row representing a different student and each column representing a different subject. The length of each row would vary based on the number of grades for each student.

Jagged arrays can be created using nested arrays or lists, and the elements of the array can be accessed using array indexing, just like with a regular multidimensional array. One advantage of using a jagged array is that it can potentially be more memory-efficient than a regular multidimensional array, as it allows for variable-length rows. However, accessing the elements of a jagged array can be slower than accessing the elements of a regular multidimensional array.