How does the string function STRING_SPLIT() work?

When compared to an earlier version, SQL Server 2016 has two new string functions shown in the next image.

String2016.png

The syntax for the new function:

STRING_SPLIT ( string , separator )

Let us take this string:

'quote, substring, toLowerCase, toUpperCase, charAt,
      charCodeAt, indexOf, lastIndexOf'

Now write the following code in the query pane of SQL Server 2016 as shown. When the query is evaluated we see that the string is split at the comma (,) as shown. The white spaces are preserved.