Soundex is an phonetic algorithm for indexing names based on their pronunciation in spoken English.
Soundex is a phonetic algorithm for indexing names by sound, as pronounced in English. The goal is for homophones to be encoded to the same representation so that they can be matched despite minor differences in spelling.
Soundex is the most widely known of all phonetic algorithms mainly because it is a standard feature of popular database software (such as MySQL, MS SQL Server and Oracle) and some programming languages (such as PHP).
Soundex was developed by Robert C. Russell and Margaret K. Odell and patented in 1918 and 1922