It aims to protect some 220 habitats and approximately 1000 species listed in the directive's Annexes (Annex I covers habitats, Annexes II, IV & V species). These are species and habitats which are considered to be of European interest, following criteria given in the directive.
The directive led to the setting up of a network of Special Areas of Conservation, which together with the existing Special Protection Areas form a network of protected sites across the European Union called Natura 2000.