Hi there!

Sessions - there is a list of tabs separated by contexts
Workspaces - there is a list of tabs AND new apps (including new accounts) for an even deeper separation of the context. As usual, using it to divide the different projects.
Collections - there is a list of saved tabs organized by folders that you can share with other people if you want. There are bookmarks on steroids. Also, there are team collections here as well in case you want to share your knowledge base with your teammates properly.