What type of virus is classified as a retrovirus?

A retrovirus is specifically classified as a type of single-stranded RNA virus that has the unique ability to reverse transcribe its RNA genome into DNA once it infects a host cell. This process is facilitated by an enzyme called reverse transcriptase, which is characteristic of retroviruses. The integrated DNA then becomes part of the host's genome, allowing the virus to hijack the host's cellular machinery for replication. This mechanism distinguishes retroviruses from other virus types, such as double-stranded DNA viruses or single-stranded DNA viruses, which do not use reverse transcription as a part of their replication cycle.