AIDS stands for Acquired Immune Deficiency Syndrome. It's a serious health problem that happens when a person's body can't defend itself against illnesses. This can happen when someone has HIV, which stands for Human Immunodeficiency Virus. HIV is a virus that attacks the body's immune system, which is the system we all have to fight off diseases. HIV can be passed from one person to another if they share things like needles, have unprotected sex, or an infected mother passes it to her baby during pregnancy, birth, or breastfeeding. It's important to know that everyone can take steps to protect themselves and others from getting HIV by using protection during sex and not sharing needles.