We have that virus have two types of cycles in which they reproduce themselves between cells, lytic and lysogenic cycles. The first one involves the inmediatly replication of their genome inside the host, multiplicating then the viral particles, which eventually will end up breaking up membrane cell from their inside, relasing them to the extracellular media, where they will infect neighbor cells. This virus is typically involved in the propagation of diseases. In the other hand, we have then the virus which have a lysogenic cycle. They doesn't replicate as former, but they get out the way