User attention in Baidu Index

I don't know what the user attention in the Baidu index means, but the actual search is not the same as this one.

For example, the keyword "secret" is searched by tens of thousands of users every day, but the attention of users is only about 2000.

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Users' attention is based on the search volume of tens of millions of users on Baidu. Using keywords as the statistical object, we scientifically analyze and calculate the weighted sum of the search frequency of each keyword in Baidu's natural search, it is displayed as a graph.