Please check my comments for first four points.
_pristine
I am not able to find this. I have also attached a screenshot for this. You can also check it by using below code snippet in your browser's console window.
$("#grid").data("kendoGrid").dataSource
_pristineData
Store your original data. This data is used in a batch update. When we click on "Cancel changes" button at that time the Grid will take the original data from here.
_data
Displayed currently applied data. If you change data in the grid then it will be applied into this data.
_view
Based on your pagesize and pageindex; this is whatever is databound to your grid. Ex: If you've bound 100 records to your grid but your page size is 10, then it will return only 10 records based in your page-index. .