The German Wasp (Vespula germanica) is a species of social wasp, meaning they live in social groups containing a queen wasp. Yellow Jackets is another common name used to describe German Wasps, after their characteristic black and yellow markings.
Yellow Jacket Wasps are often perceived as pests because they can sting and have a strong attraction to sugar. Although, where they're native, wasps can provide effective pest control, offering some pollination services, too.
German Wasps are native to Europe where they're extremely common. They've now intercepted several other locations across the world, where they're invasive. In New Zealand, they've had implications on forest ecosystems where their consumption of caterpillars and other insects has negatively impacted bird populations.
German Wasps were first introduced to South Africa in the 70s. They now have an invasive status and can cause problems when they build their paper nests in trees, buildings, or against outside walls.