There are two types of libraries in SAS: Work and Permanent.
The Work library contains temporary data sets. The data sets are deleted when the current SAS session ends.
The Permanent library contains permanent data sets. When referencing a permanent data set in the code, you must use a library reference (libref).
A permanent library can be created by using a LIBNAME statement. You can save a current SAS data set by simply copying the data into the permanent library using a SET statement.
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