The Emitter is the source of the particles. Particular offers various emitter types:
Particular transforms flat compositions into dynamic 3D environments using several key technologies: after effects particular plugin
While spheres are the default shape, Particular allows users to use custom sprites (images) as particles. You can replace a generic dot with a high-res image of a leaf, a snowflake, or a feather. This customization allows for stylized, high-end motion graphics that would take weeks to animate by hand. The Emitter is the source of the particles