Autocomplete is a feature within Google Search that makes it faster to complete searches that you start to type. Our automated systems generate predictions that help people save time by allowing them to quickly complete a search that is useful to them.
Difference between autocomplete & Google Trends
Autocomplete is a time-saving but complex feature. It doesn’t simply display the most common queries on a given topic. That’s why it differs from and shouldn’t be compared against Google Trends.
Google Trends is a tool for journalists and anyone else who wants to research the popularity of searches and search topics over time.