Reusable module that generates or responds to events. You can import and use one or more blocks in a scenario. Blocks can accept input, execute some logic, and return some results. Blocks can consist of input feeds, output feeds, parameters, and operations. Apama provides standard blocks, which are described in Developing Apama Applications in Event Modeler, "Using standard blocks" (available if you selected Developer during installation). You can define additional blocks by using Apama Studio’s block editor. Also called a SmartBlock.