Most viruses consist of four parts. the core, the capsid, the matrix, and the envelope. The core is located in the center of the virus and contains the virus’ dna or rna wrapped together with some proteins. The capsid is made of protein and forms a shell around the core. The matrix forms a layer between the capsid and the envelope, while the envelope consists of lipids stolen from the cell membrane of the host cell that the virus is growing in. The envelope also contains proteins.