By entering Allintitle and a keyword, in Google, the user will get only those results listed, where the keyword is in the title of the document. Google developed lots of such search tools for its users as a special service. Certainly, here you can also enter more than just one keyword. This service arranges its search results according to the rankings, too. Here, the frequency of the keywords in the document title is of big importance. In SEO, this service informs you about your own concurrence. People like to use this tool for keyword-research, too. This way you can easily find relevant keywords for intended websites.