To make life easier for users who would normally have several individual tabs open, meaning it can be difficult to identify which tab points to what page, Google has recognised how this can lead to frustration and confusion so they have enhanced their Chrome browser to let users create groups of tabs in order to keep everything neatly organised and easy to find.
Allocating Tab Groups
Right-click the tab for any open web page to display a pop-up menu. The first time you use this there will be an option to Add tab to new group. Thereafter the option changes to Add tab to group which allows you to either select New group to create your group or select an existing group name from the list displayed of those created earlier.
The pop-up menu also lets you assign a colour, add a new tab, split the group, close all tabs in the group, and open all the tabs in a new window. You can also drag tabs to rearrange the group, add new tabs, or even remove pages.
Right-click a tab inside a group to add a new tab, remove the tab from the group, or move it to a new or existing group.
Once you have your tabs arranged into groups, you can click a group name to hide all the tabs it contains until you are ready to use them. Not only does this save space on screen but it also reduces the browsers ongoing resource requirements.
Recovering from History
When you close your browser and then re-open it you may find it presents all of the tabs that were previously open but occasionally it may only open a single default 'new tab' [controlled by your browser settings] which can be annoying if you want to pick up from where you left off.
Here is how to get back to where you were ...
Press the three dots in the top right corner of your browser to open a pop-up menu. From here you can select History to view a section called Recently closed [that does not appear to have a direct keyboard shortcut] containing both individual tabs [as per the standard Ctrl+H shortcut] but also including any tab groups.
These tab groups are identified by a rectangle [containing a smaller black rectangle in it's top right corner] and a legend alongside saying "n tabs" [where n is a value indicating the number of tabs it contains].
Click on any such tab group to restore all of the tabs it contains.
N.B.
For convenience use a bookmark [containing the URL of this page] and name it something like "Tab Groups" so you can return to this note whenever you need to jog your memory. Remember you can save your bookmark on your Bookmarks Bar or as an icon on your New Tab page.
It appears that while the Browser History for individual tabs/sites can be synchronised across Chrome browsers, wherever you are signed into your account on multiple devices, these tab groups are not synchronised - yet ?
More Information with pictures
If you want to read about these facilities in greater depth then take a look at these .....
Click here for an article by HowToGeek called "How to Enable and Use Tab Groups in Google Chrome"
Click here for an article by ReviewGeek called "Quick Tip: Use Chrome’s Tab Groups Feature for a More Organized Browser"