Marmalade hoverfly

This hoverfly mimics a wasp but it's harmless and even useful.
In the larval stage they eat harmful aphids and in the adult stage they harvest flower nectar and help pollination.
Hoverflies are easy to distinguish from wasps because flies have very short antennas and achieve stationary flight and sudden direction changes.
Wasps on the contrary have long antennas, don't practice stationary flight and can't suddenly change flight directions.