Retroviridae is a family of viruses known for their unique ability to convert their RNA genome into DNA after infecting a host cell. This process is facilitated by an enzyme called reverse transcriptase, which is a hallmark of retroviruses. Once the viral DNA is integrated into the host's genome, it can replicate and produce new virus particles. Members of the Retroviridae family include important viruses such as HIV, which causes AIDS, and HTLV, associated with certain types of cancer. These viruses can be transmitted through various means, including sexual contact, blood transfusions, and from mother to child during childbirth or breastfeeding.