What is thruster control?

Excuse me, could you please clarify what exactly is meant by "thruster control"? Is it a specific technology used in spacecrafts or submarines to control their direction and velocity? Or is it a broader term encompassing various methods of managing thrust output in different types of engines and propulsion systems? I'm particularly interested in understanding its role in the aerospace and marine industries, as well as any potential applications it may have in the field of cryptocurrency and finance, if any. Could you elaborate on this, please?