Hi Monissha,
It is just the way data is stored internally columnar format. When you choose column store while creating the table, HANA internally assigns a data type for storing your specific data and data types which Column store data types. Anyway you dont have to worry about it while creating the table or inserting the data because you dnt use column store data types, which are generally referred as 'CS_', as it is all done internally so you just need to use SQL data types which you have used in provided screenshot. For more info you can refer link given by Vivek.
Cheers,
Sumit