The commonality shared by Jupiter, Neptune, and Saturn is that they are all gas giants.

Here's why:

* Jupiter: The largest planet in our solar system, primarily composed of hydrogen and helium with a rocky core.

* Neptune: The farthest planet from the Sun, primarily composed of hydrogen, helium, and a small amount of methane which gives it its blue color.

* Saturn: Known for its prominent ring system, also primarily composed of hydrogen and helium.

All three planets lack a solid surface and are instead characterized by swirling gas and liquid.