Domino toppling refers to the process of arranging dominoes in a sequential layout, commonly known as a domino run, and subsequently knocking over the first domino in the sequence. This action triggers a chain reaction, where each domino in turn falls into the next, resulting in a cascading effect termed the domino effect.
Competitions in which two or more players aim to be the first to knock down all their arranged dominoes may be referred to as a domino rally. When domino toppling is performed for an audience, it is typically called a domino show.