The process of evolution is based on the idea that all living things have genetic variation, which means that they all have slightly different traits and characteristics. When these variations are selected for or selected against by the environment, it can lead to the formation of new species over time. It's like a big game of survival, where the individuals that are best adapted to their environment are more likely to thrive and reproduce.
For example, imagine you're a farmer, and you're trying to breed the perfect cow. You might select for certain traits, like high milk production or resistance to disease, and breed the cows that have those traits to create a new generation of cows with those characteristics. This is similar to how evolution works, but instead of a farmer selecting for traits, it's the environment that's doing the selecting.