The reels, paylines, and symbols make up the fundamental building blocks of a slot machine. Paylines are the lines that determine winning combinations, whereas reels areavator the vertical sections that spin when they are activated. The number of paylines that players can activate frequently has an impact on the cost of each spin as well as their chances of winning. Machines differ greatly in their symbols; some use classic fruit symbols, while others might use mythological, popular culture, or film themes.