Putting in the simplest terms, aids is a disease and hiv is the virus which causes it. hiv or human immunodeficiency virus targets the immune system and weakens people's defense systems against infections. Victims lose their inbuilt ability to fight disease though immune system and highly rely on medicines.
It is not necessary that a person who is hiv positive is aids positive as well. When hiv infection reaches the highest or most advanced stage due to no treatment, it is called acquired immunodeficiency syndrome or AIDS.
As per the official website, World aids Day is important because it reminds the public and government that hiv has not gone away there is still a vital need to raise money, increase awareness, fight prejudice and improves education. So this World aids day, let’s pledge to spread as much awareness about hiv as possible and make efforts to reduce the menace of this deadly infection.