Every year countries around the world celebrate World Blood Donor Day (WBDD). The event serves to raise awareness of the need for safe blood and blood products and to thank voluntary, unpaid blood donors for their life-saving gifts of blood.

A blood service that gives patients access to safe blood and blood products in sufficient quantity is a key component of an effective health system. The global theme of World Blood Donor Day changes each year in recognition of the selfless individuals who donate their blood for people unknown to them.

http://www.who.int/campaigns/world-blood-donor-day/