Have you ever emailed a friend or family member and sent them a link to a website you thought they might find interesting? If so, you have participated in social bookmarking.
But what is social bookmarking, anyway? After all, it's not like you can take a small piece of cardboard or a sticky note and physically put it on a web page the way you can do with the pages in a real book. And even if you know how to use the bookmarks tool that comes built in with every major web browser, this still isn't "social" bookmarking.
You can think of social bookmarking like this: simply tagging a web page with a web-based tool so you can easily access it later. Instead of saving them to your web browser, you are saving them to the web. And, because your bookmarks are online, you can easily access them anywhere you have an internet connection and share them with friends.