Google Penguin 4.0 is a Google algorithm update that was introduced in the year 2016 and is the last in the Penguin series. Penguin targets sites that acquire spam links; and imposes penalties.
With Google Penguin 4.0, the data is processed in real time. Therefore, the changes are visible at a faster rate and fairly soon. If you indulge in black hat practices, you will be penalized and your site will take longer for recovery. Also, if bad links are found on webpages, only they will be affected and not the complete site.