Plorts are diamond-shaped products of slimes that they produce when fed with food, or occasionally obtained as a reward from the Range Exchange. Their main use is to generate Newbucks by selling them in the Plort Market, but can also be deposited into the Refinery of The Lab once it is unlocked to create Slime Science Gadgets. Slimes can also eat Plorts to induce a transformation into a Largo, or if already one, turn them into a Tarr. All Plorts except the Puddle, Fire and Gold Plorts can be eaten by Slimes.
In Adventure Mode, Plort values rise and fall on a daily basis and prices re-roll at midnight. This is partially influenced by how often you sell them.
Notes: Lucky Slimes do not drop plorts - they reward the rancher with a shower of Newbucks instead.
Plorts are produced when a Slime eats food. Plorts share their appearance with the Slime that created it; this makes it easy to identify the different plorts.
What exactly plorts are has not been made clear; however, whether they're excess mass given off by slimes to prevent uncontrolled growth or leftover material from foods that slimes can't use, they are, in a sense, the slime equivalent of fecal matter. This does NOT make it gross, though - just as animal feces can be highly nutritious food to plants, and oxygen is waste for plants but vital to the survival of animals, what is waste material to an alien species like slimes is not necessarily toxic or disgusting for Earth-based life forms.
When a slime first makes a plort it comes encased in a gel-like material that goes away quickly. When the plort is in this substance it can not be eaten by another slime to become a largo, but it can still be vacuumed up by you.
Plorts are very useful for a variety of purposes at companies. While this is not visually shown, it is mentioned in the game. They range from power sources, food and drinks, to even military weaponry. Plorts are vital to industries outside of the Far, Far Range.