What’s the difference between the System.Array.CopyTo() and Clone() function?

Both CopyTo() and Clone() make shallow copy (data is copied) and used for Single Dimension arrays.

Clone() method makes a clone of the original array. It returns an exact length array.

CopyTo() copies the elements from the original array to the destination array starting at the specified destination array index. Note that, this adds elements to an already existing array.

Array.Clone() creates a new array which is a shallow copy of another array. Where the array contains reference types, only the references are copied not the objects themselves, which is what is meant by a shallow copy.

Array.CopyTo() copies the elements of one array, starting from a specified index, to another array which you've already created. Only single dimensional arrays can be copied with this method.