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With the use of it we can told the Google about which type of data available into our blog or in a single page.
Page set
Page set is the set of data which we highlight of our blog page. When we select a data of a single page then Google see the data of all page like we highlight of a single page. You can give your blog main page URL or a single page URL here main page means is that the blog home page URL. When you highlight your blog data and published it then next time Google will consider your published data automatically. Data highlighter is very important in point of SEO.