Autocomplete is program which is designed for complete or fill the blank word place for creating a meaning full word and this feature provided by many web browsers, e-mail programs, search engine interfaces, source code editors, database query tools, word processors, and command line interpreters. The best using of Autocomplete in Google search engine and Google keyboard which is used for to searching required words. Autocomplete is also used in integrated, general text editors and it involves the program predicting a word or phrase that the user wants to type in without the user actually typing it in completely. Autocomplete very useful in text editors, when the prediction is based on a list of words in one or more languages. Many Autocomplete programs are able to learn new words after the user has written them a few times, and can suggest alternatives based on the learned habits of the individual user. Autocomplete speeds up human-computer interactions in environments to which it is well suited.