Smart answer:

Your search for What are Feynman diagrams returned the following results:

pictorial representations of the mathematical expressions governing the behavior of subatomic particles

In theoretical physics, Feynman diagrams are pictorial representations of the mathematical expressions governing the behavior of subatomic particles.

graphical depictions known as Feynman diagrams

Within quantum mechanics, graphical depictions known as Feynman diagrams provide the standard method for analyzing and thinking about phenomena in particle physics.

Source:

a method of representing interactions between particles

Feynman diagrams are a method of representing interactions between particles.

a graphical representation of a perturbative contribution to the transition amplitude

A Feynman diagram is a graphical representation of a perturbative contribution to the transition amplitude.

Source:

graphs of time versus position

Feynman diagrams are graphs of time versus position and are highly useful pictorial representations of particle processes.

that shows what happens when elementary particles collide

A Feynman diagram is a diagram that shows what happens when elementary particles collide.

Source:

schematic representations in which virtual particles appear as internal lines known as Feynman diagrams,

Such calculations are often performed using schematic representations known as Feynman diagrams, in which virtual particles appear as internal lines.

Source:

graphical analogies of amplitudes of probabilities, which are complex numbers

Feynman diagrams are graphical analogies of amplitudes of probabilities, which are complex numbers, using ‘calculational tricks, some of Bettina Heintz's[Feynman’s] own design and others borrowed’ (Kaiser 2005, 160).

a powerful tool in condensed matter physics

Feynman diagrams are a powerful tool in condensed matter physics.

a two-dimensional representation in which one axis, usually the horizontal axis, is chosen to represent space, while the second (vertical) axis represents time

A Feynman diagram is a two-dimensional representation in which one axis, usually the horizontal axis, is chosen to represent space, while the second (vertical) axis represents time.

Source:

the cornerstones of the model

The so-called Feynman diagrams are the cornerstones of the model and they depend on virtual particles.

a pictorial representation of a term in a perturbative expansion of the scattering amplitude for the experiment defined by the incoming and outgoing lines

Feynman diagrams are a pictorial representation of a term in a perturbative expansion of the scattering amplitude for the experiment defined by the incoming and outgoing lines.

Source:

just little cartoons that show how subatomic particles interact

Feynman diagrams are just little cartoons that show how subatomic particles interact.

Source:

that represent the interaction of particles rather than the physical position of the particle during a scattering process

Feynman diagrams are graphs that represent the interaction of particles rather than the physical position of the particle during a scattering process.

Source: