Each search engine index has a different set of Search Engine Results Pages (SERPS). Therefore, to obtain search rankings for one keyword in two different search indexes (Google.com and Google.com.au), the data has to be obtained from two different sources. This is why one keyword (i.e., black shoes) counts for two keywords when followed in two search engine indexes (Google.com and Google.com.au).
Some examples of search engine indexes are:
- Google.com New York
- Google.ca [English]
- Google.com [French]
- Google.com New York, New York 89 E 42nd St, New York, NY 10017
If for example you were following one keyword in the above 11 search engine indexes and you had purchased 500 keyword rankings for the month it would decrease your Keyword Usage Counter to 488 (500 – 11).