There are some popular desktops in Linux Environments.
KDE – a Graphical desktop that is similar to the Microsoft Windows
Xfc – a lightweight but fully functional graphical desktop
Gnome – a historically popular desktop that is the default desktop on many linux distributions
LXDE – a lightweight yet powerful graphical desktop that is specifically designed for smaller computer.
The default desktop of Raspbian is LXDE. Some one may use Xfc instdead.
Which one you prefer?