What is the use of keep and peek in tempdata in mvc?

https://www.c-sharpcorner.com/UploadFile/ansh06031982/using-tempdata-peek-and-keep-in-Asp-Net-mvc/
https://www.c-sharpcorner.com/article/using-peek-and-keep-in-tempdata-in-asp-net-mvc/

please follow my article on this

https://www.sharpencode.com/article/MVC/how-to-pass-data-in-mvc/tempdata