Irreversibility refers to processes that cannot be reversed or undone. In science, this concept is often seen in thermodynamics, where certain reactions, like the burning of wood, lead to a permanent change in the material. Once the wood is burned, it cannot return to its original state, illustrating how some changes are one-way. In everyday life, irreversibility can be observed in various situations, such as cooking an egg. Once an egg is boiled, it cannot be uncooked. This principle highlights the idea that certain actions or transformations lead to outcomes that cannot be reverted, emphasizing the nature of change in both natural and human-made systems.