Pair formation is the process of two individuals coming together to form a partnership or a relationship. There are many synonyms for pair formation, including coupling, mating, union, bonding, partnering, and pairing. Coupling refers to the act of joining and bonding two things together, while mating specifically describes the process of two individuals coming together to reproduce. Union denotes two entities coming together in a stronger connection, bonding is the act of creating a close emotional connection, partnering refers to two individuals coming together for a shared goal, and pairing implies a more equal or complementary relationship. In any case, the process of pair formation is a natural phenomenon that occurs across species and can result in deep emotional and physical attachments.