Financial abuse is a type of domestic abuse that directly involves money and assets. It can exist on its own, but often exists as part of an abusive relationship overall. For instance, someone may suffer from intimidation, which is emotional abuse, along with both physical attacks and financial abuse. Though they're all technically different, one often leads to the other, so they may all be cited in a case.
Simple financial abuse could just include telling someone that he or she doesn't get any access to the family bank account. More drastic abuse could actually involve taking money from accounts that the person holds, such as investments or retirement funds, which may even have been owned before the marriage. Oftentimes, if one partner decides to get out of the relationship and tries to leave, the other partner may take all of the money out of these accounts so that it can't be used.