When we are having more data and have to split it as many pages using pagination. By default, Yii2.0 is having that option for pagination. For the pagination, we have to send some information to page they are total item count, page size(number of records per page), current page etc.
Yii 2.0 menu widget is used to display the multi-level menu items. 'items' is the main property of Menu. It contains all the menu items with attributes.
The gridview widget is used to display the data like image, text, etc in a grid. It is having a lot features like sorting, pagination, filtering, styling etc in yiiframework2.0.