Have you ever played a game where you have to cross a street full of cars? You have to time it just right so that you don't hit any cars. The Landau-Zener formula is a bit like that game, but instead of crossing a street, it's about how electrons (tiny particles that make up everything) move between two states in a material.
Electrons can have two possible states, like a car moving fast or slow. When these states are close in energy, they can have a chance to switch from one to the other, just like you have a chance of getting hit by a car if you don't time it right. The Landau-Zener formula helps calculate the probability of this state change happening, just like how you try to predict when it's safe to cross the street.
The formula takes into account how quickly the energy levels (or "states") are changing, as well as how much energy the electrons have. Just like how you need to know how fast the cars are moving and how much time you have to cross, the formula needs this information too.
Scientists use the Landau-Zener formula to help design new materials for things like computer chips and solar cells. It helps them understand how electrons will move through the materials, which can affect how well these devices work. Think of it as a way for scientists to predict when it's safe for electrons to "cross the street" and get to where they need to be without crashing into anything.