Basically... direction. Relationships have a direction (see Power Pivot Relationships | Power Pivot | Tiny Lizard). On the many side of the relations (on the side where you have many facts/data) you can do a lookup to the (exactly) 1 match in your lookup table... using RELATED().
If you are in the 1 side (the lookup table), you can do a "lookup" to the many side, but it will return many rows. For that you are using RELATEDTABLE().
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