What is the typical virus core composed of?

The typical virus core is composed of the viral genome, which can be either DNA or RNA, enclosed within a protein coat known as the capsid. The nucleocapsid, which consists of the genetic material and the capsid together, is the innermost core structure of the virus particle. Depending on the virus type, additional structures can be present surrounding the nucleocapsid, such as envelopes, matrix proteins, and glycoproteins.