Custom Setting Methods

Special objects and field methods that support a “protected” mode for storing sensitive
information like encryption keys.

getAll():  Returns a map of the data sets defined for the custom setting. List
custom settings only.

getInstance() : Returns the “lowest level” custom setting data set for the specified
dataset name, user ID, Profile ID, or current user (depending on
parameters and setting type). Identical to getValues() for List
custom settings.

getValues() : Returns only the custom setting data set for the specified dataset
name, user ID, Profile ID, or current user (depending on parameters
and setting type).

getOrgDefaults() : Returns the custom setting data set for the organization. Hierarchy
custom settings only.