The search volume data in the keyword research tool is obtained from the Google Ads API.
It represents the average number of searches that have been performed for a particular keyword over the past 12 months, either globally or in a specific location, depending on your settings.
It’s important to note that search volume data shouldn’t be taken as a precise prediction of the traffic that your website will receive.
Instead, it’s best to use search volume data as a rough guide to help you identify potential opportunities for content creation, rather than relying on it as a definitive forecast.
You can learn more about how Keyword Tools get their search volume data here – https://blog.lowfruits.io/where-do-keyword-tools-get-their-search-volume-data.