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In Java, a jagged array is an array of arrays, where each sub-array can have a different length. This means that while all sub-arrays in a normal two-dimensional array have the same length, in a jagged array they can have different lengths.

A jagged array is also known as a ragged array or an uneven array. It is typically used when you need to represent data that doesn't fit into a regular two-dimensional grid. For example, if you were creating a program to represent the scores of different students in different classes, a jagged array would allow you to represent the scores for each student in each class, even if the number of students and classes is different.

To create a jagged array in Java, you first create the main array with a fixed number of elements, and then each element of the main array is assigned another array with a different number of elements. Here is an example of how to create a jagged array in Java: 

int[][] jaggedArray = new int[3][];
jaggedArray[0] = new int[]{1, 2, 3};
jaggedArray[1] = new int[]{4, 5};
jaggedArray[2] = new int[]{6, 7, 8, 9};

In this example, the main array has three elements, and each element is an array of integers with a different number of elements. The first element has three elements, the second element has two elements, and the third element has four elements.