google trends
• Google Trends is a free tool that shows trends in search volume and popularity of a particular keyword or topic on Google.
• Unlike Google Analytics and Search Console, Google Trends is used for market and content research, not for measuring your site's performance.

How does it work
• It analyzes all searches on Google.
• It shows in which geographic regions and in which time period a term is more popular.
• It indicates search popularity with a score between 0 and 100, with 100 representing the highest search volume.