Unmanned Aerial Systems (UAS) are aircraft that operate without a human pilot on board. They are commonly known as drones and consist of a flying vehicle, a ground control station, and a communication system. UAS can be used for various purposes, including aerial photography, surveillance, and agricultural monitoring. These systems can be remotely controlled or operate autonomously using pre-programmed flight plans. UAS technology has advanced significantly, making them more accessible for both commercial and recreational use. They are regulated by organizations like the Federal Aviation Administration (FAA) to ensure safe operation in shared airspace.