KDE Software Compilation releases are made up of the KDE Platform, Plasma Workspaces and many KDE Applications.
More about KDE Software Compilation
KDE software consists of a large number of individual applications and a desktop workspace as a shell to run these applications. You can run KDE applications just fine on any desktop environment. KDE applications are built to integrate well with your system's components. By using also KDE workspace, you get even better integration of your applications with the working environment while lowering system resource needs. KDE workspaces run fine on relatively recent PCs, but they will also work on older machines with more constrained resources. Learn more.