Satellites don't need fuel to stay in orbit in space because once the satellite is launched it is constantly falling toward Earth as a result of Gravity.
However the satellites forward momentum is what perfectly balances the pull and allows the satellite to orbit without requiring additional propulsion, thanks to the lack of friction in the vacuum of space.
Satellites only require fuel for small adjustments to their positions or course corrections.
The fuel that satellites use is hydrazine based fuel which is the satellites primary propellant.
However research is ongoing to develop a less toxic fuel due to it's highly toxic nature.
Hydrazine based fuel is often used for stationkeeping maneuvers and orbital adjustments.
Once the satellite is in it's position above earth in space the satellite requires a method of propulsion to make sure the satellite can move if it needs to.
The satellite also needs to be able to avoid space debris and compensate for drag over time as well as be able to de-orbit itself after the mission is over.
The satellites use a highly toxic hydrazine based fuel for this propellant fuel.
Hydrazine based fuel is a type of highly toxic propellant that uses hydrazine (N2H4) as its primary fuel source, commonly used in rocket propulsion systems due to its high energy density, stability, and ability to ignite spontaneously when exposed to a catalyst, making it ideal for applications like satellite thrusters and spacecraft maneuvering.
While hydrazine based fuel is a great fuel source for satellites in space, hydrazine is highly toxic and requires strict handling procedures due to its hazardous nature