A bullet is a kinetic projectile, a component of firearm ammunition that is shot from a gun barrel. They are made of a variety of materials, such as copper, lead, steel, polymer, rubber and even wax; and are made in various shapes and constructions, including specialized functions such as hunting, target shooting, training, and combat. Bullets are often tapered, making them more aerodynamic. Bullet size is expressed by weight and diameter in both imperial and metric measurement systems. Bullets do not normally contain explosives but strike or damage the intended target by transferring kinetic energy upon impact and penetration.

গুলি একটি আগ্নেয়াস্ত্র বা এয়ার গান‌ দ্বারা চালিত হয়। গুলিতে সাধারণত বিস্ফোরক থাকে না, কিন্তু উদ্দীষ্ট লক্ষ্যে গেঁথে অনেক ক্ষতি করতে পারে।