How does my computer at work know all Chrome open tabs and bookmarks on my home computer?

When I open Google Chrome on my desktop computer at work, it looks identical to the open Chrome session on my home computer. I see the same tabs and have the same bookmark list. If I add a bookmark, it will show up at home. I find all of this very convenient. If I use Chrome on a computer anywhere else, I do not get any tabs or bookmarks, even after logging into Google.