A solar system is a collection of celestial bodies, including a star (typically referred to as a "sun") and all the objects that orbit around it due to its gravitational pull. The most prominent and massive object in a solar system is the star itself, and the other objects can include planets, moons, asteroids, comets, and various other smaller bodies.
While it is theoretically possible for a solar system to contain another solar system within it, it is extremely unlikely and not commonly observed. The formation of a solar system involves the collapse of a molecular cloud, leading to the creation of a central star and the formation of a protoplanetary disk around it. The planets and other objects in the system then form from the material within this disk. The dynamics and gravitational forces involved in the formation of a solar system make it highly improbable for another solar system to exist within the same space.
However, it is worth noting that on a larger scale, galaxies can contain numerous solar systems within them. Galaxies are vast systems consisting of billions or even trillions of stars, along with their respective solar systems. So, while a solar system cannot typically contain another solar system within it, multiple solar systems can exist within a larger galactic structure.