Imagine you have a bunch of water balloons connected in a line (series) and some connected side by side (parallel). The total capacity of all the water balloons together depends on how they are connected - if they are in a line, you add up the reciprocals (like stacking pancakes), and if they are side by side, you just add them up (like stacking cookies). So, the way you connect things together can change how much they can hold!