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Transhumance is a type of controlled nomadism or pastoralism, a seasonal movement of people with their between fixed summer and winter pastures. In montane regions (vertical transhumance), it implies movement between higher pastures in summer and lower valleys in winter. Herders have a permanent home, typically in valleys. Generally only the herds travel, with a certain number of people necessary to tend them, while the main population stays at the base. In contrast, horizontal transhumance is more susceptible to being disrupted by climatic, economic or political change.

Traditional or fixed transhumance has occurred throughout the inhabited world, particularly Europe and western Asia. It is often important to pastoralist societies, as the dairy products of transhumance flocks and herds (milk, butter, yogurt and cheese) may form much of the diet of such populations. In many languages there are words for the higher summer pastures, and frequently these words have been used as place names: e.g. Hafod in Wales, Shieling in Scotland.

The word transhumance comes from French and derives from the Latin words trans 'across' and humus 'ground'. Transhumance developed on every inhabited continent. Although there are substantial cultural and technological variations, the underlying practices for taking advantage of remote seasonal pastures are similar.

Transhumance is a "form of pastoralism or nomadism".Khazanov categorizes nomadic forms of pastoralism into five groups as follows: "pure pastoral nomadism", "semi-nomadic pastoralism", "semi-sedentary pastoralism", "distant-pastures husbandry" and "seasonal transhumance".

In the Balkans, the Sarakatsani, Aromanian and Yörük peoples traditionally spent summer months in the mountains and returned to lower plains in the winter. When the area was part of the Austro-Hungary and Ottoman empires, borders between Greece, Albania, Bulgaria and the former Yugoslavia were relatively unobstructed. In summer, some groups went as far north as the Balkan Mountains, and they would spend the winter on warmer plains in the vicinity of the Aegean Sea. The Morlach were a population of Vlach shepherds who lived in the Dinaric Alps (western Balkans in modern use), constantly migrating in search of better pastures for their sheep flocks. But as national states appeared in the area of the former Ottoman Empire, new state borders were developed that divided the summer and winter habitats of many of the pastoral groups. These prevented easy movement across borders, particularly at times of war, which have been frequent.

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