UFO. Netherlands

Unmanned aerial vehicle (UAVs, also sometimes shortened as BLAH; colloquially sometimes referred to as "drone" or "drone" (from the English. drone — drone)) — aircraft without crew on Board. Created for aerial shooting, monitoring ground objects and other tasks in real time.

Distinguish UAVs for military and civil purposes.

Also they are divided into:

An aircraft is heavier than air for flights in the atmosphere (and outer space (e.g. An orbital aircraft)), which uses the airframe's aerodynamic lift to keep itself in the air (when flying within the atmosphere) and the thrust of the power (propulsion) installation for maneuvering and compensating for the loss of total mechanical energy on drag. 

Ordinary satellites, which often look like single not very bright luminous dots moving smoothly in the night sky, are quite often mistaken for UFOs. After the Starlink satellites were launched (a system of near-Earth satellites developed by SpaceX, in order to create a cheap and high-performance satellite Internet communication channel and technical transmitters for receiving and transmitting signals from Earth and orbit), it became possible to observe groups of satellites (up to 60 pieces) flying one after another.