Collection(active dataprovider),layout

I don’t Understand:

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[*]The difference between using collection(with active data provider) and not using it

[*]The difference of a block and a nested layout

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A data provider (e.g. ActiveDataProvider) is not a collection of data, but is a provider of it.

Usually it is used by a widget (d.g. GridView and ListView) that supports pagination and sorting.

The following wiki article was written for Yii 1.1, but I hope you will find it useful since the basic design is not changed for Yii 2.0.

http://www.yiiframework.com/wiki/381/cgridview-clistview-and-cactivedataprovider