Bees belong to the order of insects called Hymentoptera, or membrane wings, which also includes wasps and ants. Most of the yellow and black insects which people fear are not bees at all. Most are wasps. One of the most common and most aggressive of these is the yellow jacket. Yellow jackets are not very fuzzy, are yellow and black, and have a thin waist between the thorax, where the wings and legs are attached, and the abdomen.
Honeybees are fuzzy, are orange and black, and have a thick waist.
Bumblebees are also fuzzy but they are so much larger that few people have trouble telling them from honeybees. Yellow jackets are not pollinators like bees but they do play a role in nature that directly helps people. They eat caterpillars and beetle larvae which can be a problem to people and the plants we grow, and they get rid of dead animals by helping to eat them. When people spread out food at a picnic, they are putting out many of the things yellow jackets like to eat. Their natural foods include sweets like fruit, and meat such as caterpillars and other insects.