Refers to a small fiery particle thrown off by fire, friction, or an electrical discharge. Also used metaphorically for a trigger of conflict or a flash of inspiration.
石と石を打ち合わせると火花が出る。
When you strike stones together, sparks fly.
彼の一言が二人の間に火花を散らした。
His single remark sparked a conflict between the two.
Sparks flew from the electric drill.
Sparks from the welding flew toward us.
The fireworks sent up sparks into the night sky.