A part of string is called substring. In other words, substring is a subset of another string. In case of substring startIndex is inclusive and endIndex is exclusive.
Note: Index starts from 0.
You can get substring from the given string object by one of the two methods:
In case of string:
Let's understand the startIndex and endIndex by the code given below.
In the above substring, 0 points to h but 2 points to e (because end index is exclusive).