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The Block Definition Diagram in SysML defines features of blocks and relationships between blocks such as associations, generalizations, and dependencies.

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ExampleBlock in a Block Definition Diagram (BDD)
Source
OMG Systems Modeling Language (SysML) 1.6
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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INFO
UML keywords
Diagram
Feature
Relationship
Association
Dependency
Generalization
SysML keywords
Block
SysML Block Definition Diagram
Keywords
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The Block Definition Diagram in SysML defines features of blocks and relationships between blocks such as associations, generalizations, and dependencies.
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Blocks are modular units of system description.
Blocks provide a general-purpose capability to model systems as trees of modular components.
The specific kinds of components, the kinds of connections between them, and the way these elements combine to define the total system can all be selected according to the goals of a particular system model.
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It captures the definition of blocks in terms of properties and operations, and relationships such as a system hierarchy or a system classification tree
The Internal Block Diagram in SysML captures the internal structure of a block in terms of properties and connectors between properties.
A block can include properties to specify its values, parts, and references to other blocks.
Ports are a special class of property used to specify allowable types of interactions between blocks ...
Constraint Properties are a special class of property used to constrain other properties of blocks...
Various notations for properties are available to distinguish these specialized kinds of properties on an internal block diagram.
A property can represent a role or usage in the context of its enclosing block. A property has a type that supplies its definition.
A part belonging to a block, for example, may be typed by another block. The part defines a local usage of its defining block within the specific context to which the part belongs.
For example, a block that represents the definition of a wheel can be used in different ways. The front wheel and rear wheel can represent different usages of the same wheel definition.
SysML also allows each usage to define context-specific values and constraints associated with the individual usage, such as 25 psi for the front tires and 30 psi for the rear tires.
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