This is essentially an extension for the Chrome browser that when installed, allows users to save anything they want to Google. While it might have been designed for images, the extension will also allow users to save other items such as websites, so just like how Pocket can be used to save items for viewing later on your phone, this is more or less the same feature for your computer.
According to Google’s description, “One-click save: Click the star to save webpages for later viewing. Easily navigate your saves via an intuitive visual UI. One spot for webpages and Images: Your saved webpages and saved images from Google Image Search will live together at google.com/save.”
This extension seems to be an expansion of a similar feature launched last year on mobile devices. The extension for your Chrome browser is obviously free, so if you’re interested in checking it out, then head on over to the Chrome Web Store and install it.