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Covariance allows casting of generic types to the base types, for example, IEnumerable<X> will be implicitly convertible an IEnumerable<Y> if X can implicitly be converted to Y. // List of strings IList<string> stringList = new List<string>(); // We can convert it to an Enumerable collection IEnumerable<object> Obj= strings; For this purpose IEnumerable is marked with [...]