Biological diversity is often understood in terms of having a wide variety of plants, animals and microorganisms. However, it also includes genetic differences within each species, for example, between crop varieties and livestock breeds, as well as the variety of ecosystems (lakes, forest, deserts, agricultural landscapes) that host interactions among their members (humans, plants, animals).

Given the importance of public education and awareness about this issue, the UN celebrates the International Day for Biological Diversity annually on 22 May and invites all to take part.