1) Formal language 
Example: The string ana is equal to substrings (and subsequences) of banana at two different offsets: Example: The string ban is equal to a prefix (and substring and subsequence) of the string banana: In formal language theory, the term prefix of a string is also commonly understood to be the set of all prefixes of a string, with respect to that l...
noun a string that is part of a longer string
A string is the smallest type of variable that holds non-numeric data. Word, phrases, lines of a fil