HSV, or Herpes Simplex Virus, is a common virus that causes infections in humans. There are two main types: HSV-1, which typically causes oral herpes, and HSV-2, which usually leads to genital herpes. Both types can be transmitted through direct contact with an infected person, often during intimate activities or through kissing. Once infected, the virus remains in the body for life, lying dormant in nerve cells. Symptoms can include painful sores and blisters, but many people may not experience noticeable symptoms. Outbreaks can be triggered by factors like stress, illness, or sun exposure.