Voltage is the potential difference in charge between two points. Think of a bucket of water on top of a ladder. This has potential energy because it’s just sitting there. The taller the ladder, the higher the potential. In electronics, when positive and negative charge are separated from each other, it creates potential energy because they really want to get back together. The more the separation, the greater the potential. That is why batteries have a positive and negative end, and why they are distinguished by the amount of voltage they have. If you dump out the water, it turns into flowing kinetic energy, which in electronics is the flow of electrons, or the current (measured in amperes).