Substring: A substring is a sequence of characters within a larger string. For example, in the word "apple", "app" and "ple" are substrings.
String: In computer science, a string is simply a sequence of characters. It can be composed of letters, numbers, symbols, or any combination thereof.
Exact Match: An exact match refers to finding an identical copy or duplicate. In this context, it means finding the exact same sequence of characters from one string within another.