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    <h2 class="main-content__heading">High-Level Programming Model</h2>
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      OpenWhisk is an open source, distributed serverless computing platform
      able to execute application logic (Actions) in response to events
      (Triggers) from external sources (Feeds) or HTTP requests governed by
      conditional logic (Rules). It provides a programming environment
      supported by a REST API-based Command Line Interface (CLI) along with
      tooling to support packaging and catalog services.
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          Event Sources
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          Event sources, such as devices, queues, databases, and webhooks, emit
          classes of events in the form of triggers.
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          Triggers
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          Triggers are the class of events (including device readings, published
          messages, and data changes) that are emitted by event sources.
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          Actions
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          Actions are functions that encapsulate code – written in any supported
          language by implementing a single method signature – to be executed in
          response to a trigger.
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          Rules
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          Rules represent the declarative association between a trigger and an
          action, defining which action(s) should be executed in response to
          an event.
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          Packages
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          Packages encapsulate external services in a reusable manner and
          assemble them into triggers and actions.
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      Apache OpenWhisk is an effort undergoing incubation at The Apache
      Software Foundation (ASF), sponsored by the Incubator.
      Incubation is required of all newly accepted projects until a further
      review indicates that the infrastructure, communications, and decision
      making process have stabilized in a manner consistent with other
      successful ASF projects. While incubation status is not necessarily a
      reflection of the completeness or stability of the code, it does indicate
      that the project has yet to be fully endorsed by the ASF.
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         alt="Apache Incubator logo"></a>
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