The idea of activities have only recently been introduced with the release of KDE 4. The KDE desktop is set up so all virtual desktops use the same activity and look the same, but this can be changed.
Widgets will appear on all workspaces, along with icons, panels and other items. When using the KDE desktop you can use activities to create a completely different work environment on each workspace.
Each activity can even have its own name and function, this is great if you prefer to separate your work and play. You can use activities to add a different desktop wallpaper for each workspace, or to separate your widgets based on function.
KDE Plasma Desktop Activity Options
To create a new activity you can select the button in the top right corner of the desktop which allows you to easily manage your desktop, then select the activities button. The activities panel will then open where you can create new activities or add widgets to existing activities. The following options are contained in the KDE activities panel.
Select this option if you would like to add additional activities to your KDE Plasma desktop. This option will bring up a pop-up menu containing more options as follows.
You can create new activities based on the default templates that are provided. Here are your template options, desktop icons, folder view, newspaper layout, photos activity, or search and launch. There is also an option to get new templates.
You can also create a new empty desktop from here.
Clone Current Activity
If you select an activity you can also choose to clone the current activity.
Lastly you can choose to add some cool widgets to each of your new individual workspaces or activities.