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Inner Planes and no set number of Outer Planes. This later evolved into the Great Wheel cosmology. The fourth edition of the game used a different, very simplified cosmology with just six main planes called the World Axis Cosmology. The fifth edition has brought back a new version of the Great Wheel cosmology.
5th edition reintroduced a modified version of the Great Wheel. Demiplane of Shadow was promoted to the Plane of Shadow, the Prime Material Plane was shortened to the Material Plane, and it was stated that each Material Plane is connected to its own unique Ethereal Plane. Inner, Ethereal, Material, Astral, Outer Planes, and the Far Realm. The Shadow Plane and the Dimension of Time, if they are included, are separate from the others, and usually represented as being connected to the Material Plane.
Demiplanes, although most commonly connected to the Ethereal Plane, can be found attached to any plane. The Material Planes are worlds that balance between the philosophical forces of the Outer Planes and the physical forces of the Inner Planes—these are the standard worlds of fantasy RPG campaigns. The 2nd edition Dungeon Master’s Guide states there are several prime material planes, but several other 2nd edition products say there is only one Prime Material Plane rather than several. It is a highly flammable gaseous medium in which crystal spheres holding various Prime Material solar systems float, traversable by Spelljammer ships. The home of gods, dead souls, and raw philosophy and belief. The transitive planes connect the other planes and generally contain little, if any, solid matter or native life. It is a barren place with only rare bits of solid matter.