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Data step: a data step is a set of SAS instructions that are typically used to manipulate or create SAS data sets. Data steps are used to read existing data, modify data set contents, add observations, delete observations, write new data files, and other uses. Data steps should end with the statement “run;”.
Procedure step: a series of SAS statements where the first statement starts with the key word PROC. SAS procedures typically perform an action on the data, like creating a table, graph, or producing statistics. Procedures normally end with the
statement "run;".