Substring: Definition & Examples - Learn How to Extract Substrings

A substring is a sequence of characters within a larger string. It can be thought of as a smaller string that is contained within a larger string. The substring is defined by specifying the starting index and the length of the desired sequence of characters. For example, in the string "Hello, world!", the substring "world" can be obtained by specifying the starting index as 7 and the length as 5.