The **numpy.add()** function calculates the element-wise sum of two NumPy arrays or lists. It takes two arrays or lists as input and returns a new array that is the result of adding each element in the first array to the corresponding element in the second array. For example, if the input arrays are [1, 2, 3] and [4, 5, 6], the output array will be [5, 7, 9]. This function is useful for performing mathematical operations on arrays or lists of data.

**Example**