# Migration
## Overview
**Migration** describes the large-scale movement of people, animals, or things from one location to another. It applies to human population movements, animal seasonal journeys, cell movement in biology, and data transfer in computing.
## Etymology
From Latin *migrationem* (accusative of *migratio*, 'a moving, removal'), from the verb *migrare* ('to move, go, remove, depart'). The further etymology is uncertain; a connection to PIE **\*h₂meyǵʰ-** ('to change, exchange') has been proposed but remains debated.
## Prefix Distinctions
English has three related verbs from the same Latin root, distinguished by their prefixes:
- **Migrate**: to move from one place to another (neutral — no specified direction) - **Emigrate**: *e-/ex-* ('out') + *migrare* — to move out of a country - **Immigrate**: *in-* ('into') + *migrare* — to move into a country
The same physical movement is simultaneously emigration (from the origin country's perspective) and immigration (from the destination country's perspective). A person leaving Germany for Canada is an **emigrant** from Germany and an **immigrant** to Canada.
This prefix system makes migration one of the clearest examples of how Latin compounds encode perspective and direction.
## Types of Migration
### Human Migration Human migration encompasses voluntary movement (seeking better economic opportunities, education, or living conditions) and forced displacement (fleeing war, persecution, famine, or natural disaster). The distinction between 'migrant' and 'refugee' — a migrant moves by choice while a refugee is compelled to flee — carries significant legal and political weight.
Major historical migrations include the Bantu expansion across sub-Saharan Africa (beginning c. 1000 BCE), the Germanic migrations into the Roman Empire (4th-6th century CE), the Atlantic slave trade (16th-19th century), and the European emigration to the Americas (19th-early 20th century).
### Animal Migration Animal migration — the seasonal movement of species between habitats — was first described using the word *migration* in the 18th century. Arctic terns travel from Arctic to Antarctic and back each year (roughly 70,000 km). Wildebeest cross the Serengeti in herds of over a million. Salmon return from the ocean to their natal
The mechanisms enabling navigation — magnetic field detection, celestial orientation, olfactory memory — remain active areas of research.
### Data Migration In computing, **data migration** refers to transferring data between storage systems, formats, or computing environments. **Cloud migration** moves applications and data from on-premises infrastructure to cloud platforms. The term preserves the core meaning: organized movement from one place to another.
## Related Forms
The family includes **migrate** (verb), **migrant** (noun/adjective), **migratory** (adjective), **emigrate/emigrant/emigration**, **immigrate/immigrant/immigration**, and the combining form **trans-migration** (movement of souls between bodies, or large-scale population transfer).