The Google Keyword Tool allows you to establish words and phrases that are being searched on the Google Search Engine. This is usefull in SEO as it allows you to assess your market and in some cases determine whether you even need a website. Accessing the Keyword Tool is pretty straight forward and free. Simply click the following link
https://adwords.google.com/select/KeywordToolExternal and you are there. Please watch the following video on how to use the Google Keyword Tool.
The following is a video put together by 5min.com which we think is also worth a look...