Here's why:

* Gases vs. Plasmas: Both gases and plasmas consist of particles that are relatively far apart and move freely. However, the key difference lies in the ionization of the atoms. In a gas, atoms are neutral (equal number of protons and electrons). In a plasma, a significant portion of the atoms have lost or gained electrons, creating free ions and electrons.

* Free Electrons: The presence of these free electrons is what makes plasmas unique. They are the reason why plasmas are often called "the fourth state of matter" alongside solids, liquids, and gases.

* Examples: Plasmas are common in the universe, including:

* The Sun: The sun is a giant ball of plasma.

* Lightning: The superheated air during a lightning strike forms a plasma.

* Neon Signs: The glowing gas inside neon signs is a plasma.

In summary: Plasmas are similar to gases in that the particles are widely spaced and move freely. However, plasmas differ because a significant portion of their atoms are ionized, resulting in free electrons and ions.