Any information pattern that can be spread and replicated.
Replicators are general, any pattern applies, not just in the sense of memetics
This includes viruses, animals, genes, computer viruses, automated spam bots, crystals, bacteria, parasites.
Replicators have 3 properties:
1. Copying-fidelity (Fuzziness)
2. Fecundity (Rate of copy)
3. Longevity (Stickiness)