In biology, stolons are horizontal connections between organisms. They may be part of the organism, or of its skeleton; typically, animal stolons are external skeletons.

In botany

In botany, stems which grow at the soil surface or below ground form new plants at the ends or at the nodes. Stolons are often called runners. Imprecisely they are stems that run atop or just under the ground; more specifically, a stolon is a horizontal shoot from a plant that grows on top of or below the soil surface with the ability to produce new clones of the same plant from buds at the tip.