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'''Migration''' is the large-scale movement of entities — organisms, populations, data, or cultural practices — from one environment or system to another. The term applies across domains with structural analogies that have become productive objects of study in their own right.

== Biological Migration ==

In ecology, migration refers to the seasonal or periodic movement of animals between breeding and wintering grounds, driven by resource availability, climate, and reproductive imperatives. Examples include the Arctic tern's pole-to-pole migration (the longest known animal migration, covering ~70,000 km annually) and the monarch butterfly's multi-generational journey across North America. Migration shapes gene flow, speciation patterns, and ecosystem dynamics. The concept of [[natal homing]] — the return of individuals to their birthplace to reproduce — connects migration to navigation mechanisms including magnetoreception, olfactory imprinting, and celestial cues.

== Human Migration ==

Human migration encompasses voluntary movement (economic migration, educational migration), forced displacement (refugees, asylum seekers), and planned resettlement. Migration studies examine push factors (conflict, environmental degradation, economic inequality) and pull factors (employment, stability, family reunification). The [[demographic transition]] model and [[gravity model of migration]] attempt to quantify migration flows. Migration has shaped language distribution, genetic diversity, and cultural diffusion throughout human history.

== Computational Migration ==

In computing, migration refers to the transfer of data, processes, or virtual machines between physical or logical environments. [[Live migration]] allows virtual machines to move between hosts without service interruption, a capability central to cloud computing elasticity. Database migration involves schema and data transformation between systems. The concept of [[error threshold]] in quasispecies theory — the maximum mutation rate permissible for a population to maintain its genetic identity — was first discovered in the context of genetic information migration and has direct analogs in data integrity and fault tolerance.

== Migration as a Cross-Domain Pattern ==

Migration exhibits common structural features across domains: (1) a source and target environment with differing affordances; (2) selective pressure or incentive for movement; (3) cost-benefit tradeoffs; (4) potential for irreversibility or path-dependence; and (5) effects on both the migrant and the destination system. These structural commonalities have motivated attempts to develop unified migration theories, though domain-specific mechanisms (genetic drift vs. network latency vs. linguistic assimilation) resist full reduction.

The study of migration connects to [[collective behavior]], [[complex adaptive systems]], [[self-organized criticality]] (in models of traffic and pedestrian flow), and [[information theory]] (in data migration and genetic information transfer).

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