What is WorldCat?
{{Merge from|WorldCat Identities}} {{Infobox website | name = WorldCat | logo = WorldCat logo.svg | logo_size = | logo_alt = Five-color WorldCat emblem, with WorldCat in black letters and OCLC in smaller grey letters | logo_caption = | collapsetext = Screenshot | background = gainsboro <!-- for collapsetext heading; default grey (gainsboro) --> | screenshot_size = | screenshot_alt = | caption = WorldCat [[homepage]] as of June 2019 | url = {{Official URL}} | commercial = No | type = Network of library content and services | registration = Optional, but some features require registration (such as writing reviews and making lists or bibliographies) | language = {{hlist|Chinese (Simplified)|Chinese (Traditional)|Czech|Dutch|English|French|German|Italian|Korean|Japanese|Portuguese|Spanish|Thai|Urdu}} | num_users = | content_license = [http://www.oclc.org/en/policies/copyright.html Copyright policy] | programming_language= | owner = [[Online Computer Library Center]] | launch_date = {{start date and age|1998|1|21}}<ref>1998 is the date of registry of the WorldCat.org domain; see: {{cite web|url=http://whois.domaintools.com/worldcat.org|title=WorldCat.org WHOIS, DNS, & Domain Info – DomainTools|work=[[WHOIS]]|access-date=2017-01-21}} However, the union catalog that became WorldCat was started three decades earlier, and it was already available on the web to subscriber libraries at OCLC.org several years before WorldCat.org was a registered domain name; see: {{cite web|url=http://whois.domaintools.com/oclc.org|title=OCLC.org WHOIS, DNS, & Domain Info – DomainTools|work=[[WHOIS]]|access-date=2019-06-26}}</ref> | issn = <!-- ISSN, e.g. 1085-6706 (automatically linked to http://www.worldcat.org) --> | oclc = 756372754 | current_status = Online }} '''WorldCat''' is a very big [[online]] catalog, a list of books and things like books in tens of thousands of [[lib