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ControlFlows are used to explicitly sequence execution of ActivityNodes, as the target ActivityNode cannot receive a control token and start execution until the source ActivityNode completes execution and produces the token.

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Source
Unified Modeling Language 2.5.1
Copyright information
About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
Snippet kind
SEMANTIC
UML keywords
Activity
ActivityEdge
ControlFlow
ActivityNode
ActivityEdge::target
ActivityEdge::source
execution
control token
A ControlFlow is an ActivityEdge that only passes control tokens (and some object tokens as specified by modelers, see isControlType for ObjectNodes ...).
Full quote
ControlFlows are used to explicitly sequence execution of ActivityNodes, as the target ActivityNode cannot receive a control token and start execution until the source ActivityNode completes execution and produces the token.
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Related snippets
There are two kinds of ActivityEdges:
A ControlFlow is an ActivityEdge traversed by control tokens or object tokens of control type, which are use to control the execution of ExecutableNodes
A ControlFlow is an ActivityEdge that only passes control tokens (and some object tokens as specified by modelers, see isControlType for ObjectNodes ...).
Related snippets (backlinks)
An ObjectFlow is an ActivityEdge that can have object tokens passing along it. ObjectFlows model the flow of values between ObjectNodes.
Unlike ControlFlows, ObjectFlows also provide additional support for multicast/receive, token selection from ObjectNodes and transformation of tokens
There are three kinds of ActivityNodes:
ControlNodes act as “traffic switches” managing the flow of tokens across ActivityEdges. Tokens cannot “rest” at ControlNodes (with exceptions for InitialNodes and ForkNodes ...).
ObjectNodes hold object tokens accepted from incoming ObjectFlows and may subsequently offer them to outgoing ObjectFlows (with a modeler-specified exception for ControlFlows, see isControlType for ObjectNodes ...).
ExecutableNodes actually carry out the desired behavior of an Activity. If an ExecutableNode has incoming ControlFlows, then there must be tokens offered on all these flows that it accepts before beginning execution.
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