They are subtle and generally do not take up much space, but the transition from the completed task. They generally appear after an action is being processed or committed. They can be of various sizes, located in line with the content or centered. A Spinner is shown when it's unsure how long a task will take making it the indeterminate version of a progress indicator.
A Spinner is an outline of a circle that animates around itself indicating to the user that things are processing.
