Commands do not normally know which target they are operating on. They know only that they can operate on a certain type of target and what action they can take against this target.
Command binding allows you to keep a command log or history. Further, because commands can both have a binding and not have a binding to a target, it is possible to have a single bound command that is capable of calling other commands on the same target.
The first (bound) command simply passes its target on to the other (unbound) targets. This can be a very efficient way of executing multiple commands on a single target.
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