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{{Short description|Computational threads scheduled by a run-time library}}
{{Distinguish|green thread}}
In [[computer programming]], a '''virtual thread''' is a [[Thread (computing)|thread]] that is managed by a [[runtime library]] or [[virtual machine]] (VM) and made to resemble "real" operating system thread to code executing on it, while requiring substantially fewer resources than the latter.
Virtual threads allows for tens of millions of preemptive tasks and events on a 2021 consumer-grade computer,<ref name="javaworld2">{{cite web |last1=Rudell |first1=Harald |date=2022-03-19 |title=massivevirtualparallelism |url=https://codeberg.org/haraldrudell/massivevirtualparallelism/src/branch/main/README.md |website= |quote= |df= |accessdate=}}</ref> compared to low thousands of operating system threads.<ref>{{Cite web |last=baeldung |date=2022-01-02 |title=Maximum Number of Threads Per Process in Linux {{!}} Baeldung on Linux |url=https://www.baeldung.com/linux/max-threads-per-process |access-date=2022-03-30 |website=www.baeldung.com |language=en-US}}</ref> Preemptive execution<ref>{{Cite web |title=Go 1.14 Release Notes - The Go Programming Language |url=https://go.dev/doc/go1.14#runtime |access-date=2022-03-30 |website=go.dev}}</ref> is important to performance gains through parallelism and fast preemptive response times for tens of millions of events.
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