Difference between filters and selection steps OBIEE 11g?

What is the difference between filters and selection steps OBIEE 11g?

In one way both filters and selection steps to limit the results(that are displayed when an analysis is run) in any analysis.Also,Both can be applied directly to attribute and measure columns but filters should will be applied before the selection steps are applied.
Filters:Filters are applied before the query is aggregated and affect the query and thus the resulting values for measures.
Selection steps:These are applied after the query aggregated and affect only the members displayed,not the resulting aggregate values.

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