The Keyword Suggestion tool for Google will help you choose relevant and popular terms related to your selected key term. Simply enter a key term and this tool will query information from several Google searches, which it will use to determine popular and re-occurring terms used by websites in the same industry.
The relevancy of a key term is determined by counting the number of times a given term occurs. You may notice that on occasion a term has a higher relevance than the term you entered. This is because it appears more often in Google searches related to your term than your input term does.
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