German wasp ('Vespula germanica')

One of the most common wasps in Europe.  It has a bad reputation of being annoying, aggressive, ... but actually they are extremely useful!  They eat large amounts of mosquitos, spiders, aphids, caterpillars, ...  So if you have a nest in your garden and it's not in an 'inconvenient place', it's better to just leave it there and enjoy the fascinating activity of the colony.