Here's a breakdown:

* Apoapsis: The point in an elliptical orbit where the orbiting object is furthest from the body it is orbiting.

* Periapsis: The point in an elliptical orbit where the orbiting object is closest to the body it is orbiting.

For orbits around Earth, the specific term for apoapsis is apogee.

Important Note: The highest point of an orbit is dependent on the specific orbit in question. Some orbits are very high (like geostationary orbits), while others are relatively low (like the International Space Station).