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This is something that has the same features as the regular index in a library. The format is such that follows the system of a library. Look at it this way: in a library, the information about the different books accessible are listed. In that equivalent vein, Google indexed pages checker is a list of the different pages Google has information about.
For that to occur, Google makes a regular visit to the different website available and use it to refresh their information. So, if you create a new one or update the bygone one, they will be indexed. For your website to be seen among any search result, they should be included in the Google Index.
Google Index Checker is an API used to recognize your website in the Google index list. At times Google, bots crawl through some pages and still not index them. The issue isn't the number of time you have changed or created the correct page for you to be at the top of search results. The issue is indexation. If you can right utilize the right Google index checker, you have a higher chance of springing to the top.