Band Aids aid you in healing and protect you, they keep cuts from bleeding constantly, which helps form a scab (will heal faster).... Also it helps (doesn't prevent) cuts, scrapes, etc. from getting...
AIDS is a lead of HIV. AIDS occurs when HIV has defeated your immune system. And now, the disease will be worse. AIDS is like HIV, except without an immune system.
No you can not. One of you have to have HIV or AIDS to get it. But if one of you has had sex with a person with the AIDS virus, it's possible to pass the virus on before you develop symptoms...