.net - Explain in small words why IQueryable<T> is needed -

Is there a better job you can tell why we need the marker interface which does not add any method to IEnumerable can?

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this will be IEnumerable , IQueryable and IEnumerable & lt; T & gt; is expanded. It may be that it does not have its own methods, but it adds these three interfaces as one, so you do not have to deal them separately.