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{{More citations needed|date=March 2010}}
'''Event processing''' is a method of tracking and [[data analytics|analyzing]] (processing) streams of information (data) about things that happen (events),<ref name=LuckhamD>{{cite book|last=Luckham|first=David C.|title=Event Processing for Business: Organizing the Real-Time Enterprise|url=http://ee.stanford.edu/~luckham/|publisher=John Wiley & Sons, Inc.|___location = Hoboken, New Jersey|year=2012|page=3|isbn=978-0-470-53485-4}}</ref> and deriving a conclusion from them. '''Complex event processing''', or '''CEP''', is event processing that combines data from multiple sources<ref>{{citation|last=Schmerken|first=Ivy|title=Deciphering the Myths Around Complex Event Processing|url=http://www.wallstreetandtech.com/data-latency/207800335|publisher=Wall Street & Technology|date=May 15, 2008}}{{Dead link|date=July 2019 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> to infer events or patterns that suggest more complicated circumstances. The goal of complex event processing is to identify meaningful events (such as [[business opportunity|opportunities]] or threats)<ref name=Bates>{{citation|last=Bates|first=John|title=John Bates of Progress explains how complex event processing works and how it can simplify the use of algorithms for finding and capturing trading opportunities|url=http://fixglobal.com/home/secrets-revealed-trading-tools-uncover-hidden-opportunities/|publisher=Fix Global Trading|accessdate=May 14, 2012}}</ref> and respond to them as quickly as possible.
These events may be happening across the various layers of an organization as sales leads, orders or customer service calls. Or, they may be news items,<ref>{{citation|last=Crosman|first=Penny|title=Aleri, Ravenpack to Feed News into Trading Algos|url=http://www.wallstreetandtech.com/articles/217500395|publisher=Wall Street & Technology|date=May 18, 2009}}{{Dead link|date=July 2019 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> text messages, social media posts, stock market feeds, traffic reports, weather reports, or other kinds of data.<ref name=LuckhamD /> An event may also be defined as a "change of state," when a measurement exceeds a predefined threshold of time, temperature, or other value. Analysts suggest that CEP will give organizations a new way to analyze patterns in real-time and help the business side communicate better with IT and service departments.<ref>{{citation|last=McKay|first=Lauren|title=Forrester Gives a Welcoming Wave to Complex Event Processing|url=http://www.destinationcrm.com/Articles/CRM-News/Daily-News/Forrester-Gives-a-Welcoming-Wave-to-Complex-Event-Processing-55492.aspx|publisher=Destination CRM|date=August 13, 2009}}</ref>
The vast amount of information available about events is sometimes referred to as the event cloud.<ref name=LuckhamD />
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* [[Oracle SOA Suite|Oracle Event Processing]] - for building applications to filter, correlate, and process events in real time.
* BRMS - A rules management engine by [[Red Hat]] based on [[Drools]]
* [[SAP SE|SAP ESP]] - A low-latency, rapid development and deployment platform that allows processing multiple streams of data in real time<ref>
* [[SAS ESP]] - A platform that is built for speed to analyse (apply SAS' and third-party analytics, including machine learning algorithms) millions of data records in motion (events) with low-latency response time (milliseconds and sub-milliseconds). Deployable at the edge, on premises and to the Cloud. Flexible platform that is built with openness in mind to make Analytics pervasive everywhere.<ref>{{cite web|url=https://www.sas.com/en_gb/software/data-management/event-stream-processing.html|title=SAS Event Stream Processing|publisher=}}</ref>
* [[Sqlstream|SQLstream]] SQLstream’s stream processing platform, s-Server, provides a relational stream computing platform for analyzing large volumes of service, sensor and machine and log file data in real-time.
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