Personalized Google Suggestions

Google's search suggestions change depending on your previous searches. Just like search results, which are influences by your search history, suggestions related to the queries you've previously typed are more likely to be useful.

Here's an example: I typed "swiss" and got these suggestions: "swiss colony", "swiss army", "swiss army knife".

Then I searched for "kale".

Here are the suggestions displayed when typing "swiss" again: "swiss chard", "swiss colony", "swiss army", "swiss army knife". As you can see, there's a new suggestion and it's placed at the top of the list: swiss chard, a leafy green vegetable, just like kale.

I searched for "rolex" and typed "swiss" again. This time, suggestions include "swiss watches" and "switch army watches".

This is a feature added by Google back in 2009.