Difference between Sorter and Aggregator in Informatica?

Aggregator	Sorter
Aggregator transformation performs aggregate calculations, such as averages and sums.	Sorter Transformation is used to sort the data
Aggregator uses aggregate cache  to perform aggregate calculations	Sorter uses Sorter cache to perform the sort operation
Aggregation done by  using aggregate expression with conditional clauses,	Sorting is done based on the sort key and the order of sort key
Aggregator uses Incremental aggregation to perform aggregation calculations incrementally.	There is nothing called incremental aggregation in sorter