Auto-complete refers to the way search boxes or other text entry show you one or more options as you type. For example Google search shows a dropdown of common search terms that start with the letters you have types so far and many phones show 3 or four suggested word completions above the soft keyboard. Auto-complete uses past history of entries to predcit the most likely full entry based on the text types do far. This might be based on a fixed lexicon for example, names of countries in an address entry field, the users own past history of interactions, or the combined history of the complete user base. Some autocmplete systems sue some form of statistical technqiues, perhaps the most frequent past terms that match the text so far. Other may use some form of AI, notably large language models, which are effectively optimised for exactly this task even though they have far wider application.
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