As you type information in the search box, Google Suggest guesses what you’re typing and offers suggestions in real time, similar to Google’s “Did you mean?” feature that offers alternative spellings for your query after you search.
For example, if you type “windows”, Google Suggest might offer a list of refinements that include “windows media player” or “house window”. It even works with incomplete words. Example, if you type “manu”, Google Suggest just might offer you options such as “manuscript”, “manufacture”, or “manual”. You choose one by scrolling up or down the list with the arrow keys or mouse.