AIDS means Acquired Immune Deficiency Syndrome which is caused by the HIV virus. Can be transmited by having intercourse or by AIDS carriers giving blood donations.By rumors it usually is common among gay men.
Some beleive the history of AIDS originated somewhere in Africa where some genious tried having relations with a chempanzee who was the carrier of AIDS.But this cannot be 100% proven.
Many people tend to beleive that AIDS kills you. Well it doesn't, it just leads to the events that kill you. It gradually destroyes your immune system until your body is too weak to repel any bacteria that enter the body which results in death. Although there isn't any known cure for AIDS, there are medications that increase people's long term survival.