ENM is short for External Network Monitor and poly is short for polyamory. Both ENM and poly are relationship styles that involve having more than one romantic partner. The main difference between the two is that ENM generally refers to relationships where all parties are aware of and consent to the other partners, while poly can refer to both open relationships and secret/hidden relationships. Additionally, people who identify as ENM are often interested in multiple relationship types (e.g. monogamous, non-monogamous, swinging) while those who identify as polyamorous are usually only interested in non-monogamous relationships.