Allows you to view what people are searching for on your website, what keywords are being used to search your site.
This also allows you to look for any common misspellings and offer an alternative search term.
e.g if you find people are searching your site for "guitar fx" you can train the search facility to come back with the suggestion - You could also try "guitar effects"
Similarly if some products are known by different terms you can train it to search for those as well:
e.g. if people are searching for "power supply" you could offer suggestions like "power adapter", "power adaptor" or "ac adaptor" etc.