I am going to explain in simple manner about Synchronous and Asynchronous Transformations in SSIS, as we know in SSIS everything based on transformations only, so these divided into few types.
Synchronous and
Asynchronous
Mostly we should prefer for Synchronous only when we are not able to meet our requirements using Synchronous then only we should go for Asynchronous Transformation.
Synchronous (non-blocking):
Processing the row by row transformation into next task, in detail, one record will not wait /depend on buffer for other record, example Data Conversion Transformation, DCT will not wait / depend on other record to transform to the next task simply it will convert the record and send to the next task, so Output is Synchronous with Input.
Asynchronous(Fully Blocking):
Processing rows will depend on other / next record based on those next record it will take the decision and transform to the next task, Example, Sort Transformation, in this transformation holds the all records on buffer then it will make the decision based on the data then only records will pass to the next task.
More about these Transformation please go through below link(s).
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