A Blade is a Google custom search engine focused on a single topic. Instead of searching the entire web at google. com, you can use a Blade to cut through the clutter and search only a subset of the web, like the top trusted websites covering a topic. Creating a Blade is quick and easy, and there are no limits to the amount you may use or share them. If you create a free account. You can then star and save your favorite Blades and create Blades.