AnswerThePublic obtains keyword monthly search volume information from various sources, including partnerships with different data providers. These sources gather data from user search behavior and provide estimates of the monthly search volume for specific keywords.
Please observe that all search volume estimations are from the previous month. I.e. If you check the keyword report in January, the search volume data is from December.
The same works for Bing and YouTube data. We obtain them from our data providers and it is updated every month.
Apart from volume data, AnswerThePublic takes into consideration keyword seasonality in the wheels graph.
Keyword seasonality refers to the fluctuations in search volume and popularity of specific keywords on search engines over different times of the year, which are influenced by seasonal events, holidays, or consumer behavior patterns. Certain keywords may become more popular when they are more relevant to the time of year.
For example, search terms like "best sunscreens" might peak during the summer months, "Halloween costumes" will see a spike in searches as October approaches, and "Christmas gift ideas" will naturally be more popular around November and December.
It means that keywords with a low volume (or no volume) can appear as more popular in the AnswerThePublic graph than higher volume terms.
For more information on AnswerThePublic data sources, please check What Timeframe Is Your Data From? And Where Do We Get Cost-Per-Click From?