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A block or typically called a blocker , is some action or deliverable that is preventing the completion of another task. For example, imagine you were creating a website and you have designs and some code complete, but you are waiting on IT to provide servers to host it. You would say that IT is blocking process on the next steps of the project (e.g. QA, code review, deployment) or the IT servers is a are the blocker. Blocking is explicit in Bugzilla given that each bug can reference other bugs that are either dependent on its completion or the bug itself blocks another bug. A bug is not really complete unless all of the dependent bugs have been resolved.