Particle modifiers, or Pmods for short, offer you a way to modify particles in different and interesting ways. The basic modifier applies simple uniform transform controls for particles, whereas the random modifier applies the same thing, but randomly. The step modifier applies stepped transforms based on the particle's ID value, useful when applied to Point Clouds, but not limited to just them. The sieve modifier acts as a conditional controller, modifying particles based on user defined criteria. The expression modifier provides an extremely powerful means to modify particles procedurally and the look at modifier makes it easy to have the particles point toward specific items.