A satellite is said to be geosynchronous when it orbits the Earth at the same rotational speed and in the same direction of rotation.
For the observer on Earth, a geosynchronous satellite appears at the same position in the sky at the same time every day. During the 24-hour rotation of the Earth, the satellite can remain in the same position, but it can also deviate from the position and describe an orbit. It is crucial for geosynchrony that the satellite returns to the same position in the sky after one rotation of the Earth.
It is different if it is a geostationary satellite. With this positioning, the satellite must orbit the earth on equatorial plane at a distance of 35,786 km. Only then does the satellite always appear stationary to the observer.