Any time there is an update to the database on which the Penguin Update runs, it is called a “data refresh”. Google rolled out new iterations of their Penguin Updates at different times to the different search-markets.
Penguin Update iterations by language-region or search-market
Penguin Update 2.1
Penguin Update 2.0 (Algorithm-Update, no data refresh)
Penguin Update #3
Penguin Update #2
|Penguin Update #1|
If you want to know more about the difference between an “Update” and a “data refresh”, please see our article “What is the difference between an update and a data refresh?”.