Life is over for SEO’s…not!
Now we have a thing called Keyword Planner that has replaced the Keyword Tool. When you attempt to click on the link that looks like “https://adwords.google.com/o/KeywordTool” normally, it will redirect you to the “Adwords Support Article” that explains about the changes.
In general, you’ll just need to depend on the new tool if you’re hoping to do the same keyword research you did in the past.