Difference between Sorter and Rank transformation in Informatica?

Sorter	Rank
Sorter is used to Sort the data either ASC or DSC	Rank is used to arrange data from top or bottom Group by can be done using Rank
Sorter can be used to remove duplicates(Use Distinct ouptut)	We can remove duplicates using Rank
In sorter we cannot assign values to the ports	In rank we can assign variables and write non-aggregate expressions also.
In sorter the Integration Service uses Sorter Cache to perform the sort operation.	In Rank the Integration Service stores group information in an index cache and row data in a data cache.