It is a process when the planet is formed, and the rotation/revolution of the planet around the sun.
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Planets are round due to gravity pulling material towards their center, which results in a spherical shape. This is known as hydrostatic equilibrium, where gravity balances the internal pressure caused by the material pushing outwards. Over time, this gravitational force molds planets into the most energy-efficient shape, which is a sphere.
There are two planets with an almost perfectly spherical shape. They are Mercury and Venus.
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All planets in our solar system have elliptical orbits.
Ellipses
Planets orbit in an elliptical shape, which is like a stretched circle with two foci. This shape allows for the planets to move closer and farther from the sun during their orbit.