Mycoviruses infect a huge spectrum of fungal hosts and are thought to be of historic origin. The strict intracellular lifestyle, transmission bottlenecks, stamping-gadget mode of replication and constrained transmission are probably responsible for the sluggish evolution of mycoviruses. Although mutation and selective sweep are the main evolutionary forces in mycoviruses, recombination, horizontal gene transfer, interactions between coinfecting mycoviruses, and host outcomes via codon optimization are suggested in a few taxa. Phylogenetic analyses of mycovirus replication and coat proteins propose polyphyletic origins. Recent advancements in cryo-imaging provide the promise of high-decision structural analyses of mycovirus debris to take a look at evolution and higher-order classification. Fungal viruses or mycoviruses are substantial in fungi and are typically associated with symptomless infections. Mycoviruses are transmitted intracellularly during cellular division, sporogenesis, and cell fusion, and they lack an extracellular section to their life cycles. Their natural host levels are limited to individuals inside the same or carefully associated vegetative compatibility groups. Recent technological advances, however, allowed the established order of experimental host ranges for a few mycoviruses. Although the majority of acknowledged fungal viruses have double-stranded RNA (dsRNA) genomes which can be packaged in isometric particles, more and more mycoviruses with single-stranded RNA genomes are being stated.