Bullets come in many shapes and sizes, and specific bullets are available depending on their intended usage. For example, Full-Metal-Jacket (FMJ) bullets are typically used for practice shooting or training while Softpoint bullets are used for hunting purposes.
Some bullet types expand upon impact while others are designed to prevent tip deformation. In addition, bullets have different bases based on the bullet design, gun model, and intended usage.
Diamond K Brass has put together the following visual guide for choosing a type of bullet.