The '''University of Illinois Department of Computer Science''' is the academic department encompassing the discipline of [[computer science]] at the [[University of Illinois at Urbana-Champaign]]. According to [[U.S. News & World Report]], both its undergraduate and graduate programs rank in the top five among American universities.<ref>{{cite web|title=Best Computer Science Programs {{!}} Top Computer Science Schools {{!}} US News Best Graduate Schools|url=http://grad-schools.usnews.rankingsandreviews.com/best-graduate-schools/top-science-schools/computer-science-rankings|accessdate=10 March 2022}}</ref><ref>{{cite web|title=Best Undergraduate Computer Science Programs Rankings|url=https://www.usnews.com/best-colleges/rankings/computer-science-overall|accessdate=10 March 2022}}</ref> The department ranks in the top two among American universities for faculty submissions to reputable journals and academic conferences, as determined by CSRankings.org.<ref>{{Cite web|url=https://csrankings.org/|title=CSRankings: Computer Science Rankings|first=Emery|last=Berger|date=10 March 2022}}</ref> According to Computer Science Open Rankings,<ref>{{Cite web |title=computer science open rankings |url=https://drafty.cs.brown.edu/csopenrankings/ |url-status=live |access-date=19 April 2022}}</ref> the department ranks equally high in placing Ph.D. students in tenure-track positions at top universities and winning best paper awards. The department also ranks in the top two among American universities for faculty submissions to reputable journals and academic conferences, as determined by CSRankings.org.<ref>{{Cite web|url=https://csrankings.org/|title=CSRankings: Computer Science Rankings|first=Emery|last=Berger|date=10 March 2022}}</ref> From before its official founding in 1964 to today, the department's faculty members and alumni have contributed to projects including the [[ORDVAC]], [[PLATO (computer system)|PLATO]], [[Mosaic (web browser)]], [[JavaScript]] and [[LLVM]], and have founded companies including [[Siebel Systems]], [[Netscape]], [[Mozilla]], [[PayPal]], [[Yelp]], [[YouTube]], and [[Malwarebytes]].
