Eleven subspecies of the White Wagtail (Motacilla alba) are currently recognised and they all have slightly different plumages.
This is Motacilla alba alba, the nominate subspecies of the White Wagtail which occurs on the European continent and migrates down as far as Kenya.

1st & 2nd photo: Eifel National Park, Paulushofdamm, North-Rhine Westphalia, Germany, 5 May 2022
3rd & 4th photo: Lindau, Bavaria, Germany, 10 July 2013
5th photo: Überlingen, Bavaria, Germany, 13 July 2013