What is a geostationary satellite? What is the orbital period of a geostationary satellite?

(N/A) geostationary satellite is an Earth satellite that has an orbital period of $24$ hours,which is equal to the rotational period of the Earth about its own axis. It appears stationary when viewed from the Earth and revolves around the Earth in the equatorial plane in the west-to-east direction.
To achieve this,the satellite is placed at a suitable height $(h)$ from the Earth's surface.
If a satellite of mass $m$ revolves at a distance $r = R_{E} + h$ from the center of the Earth,the height $h$ from the Earth's surface is given by the formula:
$h = \left( \frac{GM_{E} T^{2}}{4 \pi^{2}} \right)^{\frac{1}{3}} - R_{E}$
For a geostationary satellite,the orbital period $T = 24$ hours. Substituting this value,we get:
$h \approx 35,800 \text{ km}$
This type of satellite is widely used for telecommunication purposes.