A spark is a tiny, bright flash of light and heat, like the ones that jump from a campfire or fly up when you strike two rocks together. A spark happens when something gets hot enough or moves fast enough to create a brief burst of energy.

But spark also means the beginning of something bigger. When historians talk about the spark that started the American Revolution, they mean the small event that ignited a much larger movement. An inventor might have a spark of inspiration, a sudden flash of a good idea. A teacher might try to spark curiosity in students by asking an intriguing question. In these cases, a spark is that initial moment of energy or excitement that can grow into something significant.

You might also hear people talk about someone having spark, meaning they have energy, liveliness, or that special quality that makes them interesting. A performance with spark feels alive and exciting, while one without it might feel flat or boring.

The word can be a noun (a spark flew from the fire) or a verb (the flint sparked when struck). Whether it's a physical flash of light or the beginning of an idea, a spark is small but full of potential.