Workspaces are arrangements of windows and panels, combined with other interface options. Maya includes some predefined workspaces (factory), including the default Maya Classic workspace, and others designed for specific workflows. You can also create and share your custom workspaces.
Workspaces provide a more flexible way to customize the interface than the panel layout feature. In particular, workspaces let you move and dock panels anywhere, while panel layouts control only the arrangement within the View panel. Another difference is that workspaces are stored as separate files in your user directory and persist automatically, while panel layouts are stored in scene files.
Watch the following video to learn to use workspaces in Maya.
See the Workspaces in the Maya Help to read more about this feature.