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=== ICTV classification ===
The [[International Committee on Taxonomy of Viruses]] (ICTV) developed the current classification system and wrote guidelines that put a greater weight on certain virus properties to maintain family uniformity. A unified taxonomy (a universal system for classifying viruses) has been established.  Only a small part of the total diversity of viruses has been studied.<ref>{{vcite journal|author=Delwart EL|title=Viral metagenomics|journal=Reviews in Medical Virology|volume=17|issue=2|pages=115–31|year=2007|pmid=17295196|doi=10.1002/rmv.532}}</ref>

The general taxonomic structure of taxon ranges actually used (as of November 2018) is as follows:

:::::[[Phylum (biology)|Phylum]] (''-viricota'')
::::::Subphylum (''-viricotina'')
:::::::[[Class (biology)|Class]] (''-viricetes'')
:::::::::[[Order (biology)|Order]] (''-virales'')
::::::::::Suborder (''-virineae'')
:::::::::::[[Family (biology)|Family]] (''-viridae'')
::::::::::::Subfamily (''-virinae'')
:::::::::::::[[Genus]] (''-virus'')
::::::::::::::Subgenus (''-virus'')
:::::::::::::::[[Species]]

As of 2018, [[List of Virus Orders|14 orders]], [[List of virus families and subfamilies|143 families, 64 subfamilies]], [[List of genera of viruses|846 genera]], and [[List of virus species|4,958 species]] of viruses have been defined by the ICTV.<ref>ICTV Virus Taxonomy [https://talk.ictvonline.org/taxonomy/p/taxonomy_releases ICTV Virus Taxonomy Release History]</ref> The orders are the ''[[Caudovirales]]'', ''[[Herpesvirales]]'', ''[[Ligamenvirales]]'', ''[[Mononegavirales]]'', ''[[Nidovirales]]'', ''[[Ortervirales]]'', ''[[Picornavirales]]'', ''[[Bunyavirales]]'', ''[[Tymovirales]]'', ''[[Muvirales]]'', ''[[Serpentovirales]]'', ''[[Jingchuvirales]]'', ''[[Goujianvirales]]'', and ''[[Articulavirales]]''.<ref>{{vcite web|url=https://talk.ictvonline.org/taxonomy/|title=Taxonomy|website=International Committee on Taxonomy of Viruses (ICTV)|language=en|access-date=27 November 2018}}</ref>