The first World AIDS Day took place in 1988, just four years after HIV was identified.
Organizers say the purpose is for people across the world to unite in the battle against HIV, show support for those living with it, and commemorate those who have died.
According to worldaidsday.org, an estimated 34 million people have the virus and more than 35 million people have died as a result of HIV or AIDS.
The group asks people wear a red ribbon today and raise money for the National AIDS Trust.
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