There is so much information on the internet every day that even if you bookmark a website to read it later, you may forget that you even bookmarked it. Even if you use an app like Raindrop, if you forget that you bookmarked a site, you won't be able to search for it within Raindrop. There's no point in bookmarking important information if you can't dig it up. On the other hand, using stacks changes that. Just do a normal search in Chrome's search window and it will check if there is any information you have already saved from the bookmarks you have stored in stacks. Almost as soon as a keyword search result appears on Chrome, the stacks extension will display information related to the keyword bookmarked in stacks on the right side of the browser. You can stop wasting your search by realizing, "Oh, I looked up this information before and bookmarked it!" Therefore, stacks can be said to be a function of Raindrop with a memory function added. This is very useful.