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Multipathing is simply having redundant IO paths between systems and storage.  Multipathing is not the same as network redundancy. 
It is more of a connecting technology than a SCSI/storing technology.  It provides multiple initiator-to-LU paths. 
One way to implement multipathing is using Active/Passive mutlipathing.  The administrator decideds what path is active.  You can also use static load balancing in this type of setup. 
Active/Active is dynamic load balancing.  This is achieved with something like round-robin, least blocks, or least IO to distribute the load. 
Multipathing is based on SCSI architecture.  It is important to watch how LUNs are assigned to subsystem ports and LUs. 

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