A series circuit is a type of electrical circuit where components are connected end-to-end in a single path. This means that the same current flows through each component, such as resistors, light bulbs, or batteries. If one component fails or is removed, the entire circuit stops working because the current cannot complete its path. In a series circuit, the total voltage is divided among the components, and the total resistance is the sum of all individual resistances. This configuration is commonly used in simple applications, like Christmas lights, where the failure of one bulb can affect the entire string.