Google Trends is a simple way of tracking interest in a topic over time. You can use the pre-selected times that Google suggests or you can put in a custom time range. What you learn can help you understand what topics and terms your audience is most interested in.
This has been highlighted lately with the move from 2019 to 2020. Google released some decade-based search information to show how things have changed over time. For instance, the most searched meme in the past decade was the happy birthday meme. The most searched dance was the Harlem Shake.