An Isolated Margin pertains to the Margin Balance that is allotted to a certain position. The Isolated Margin mode permits traders risk management of individual positions that they choose to open. This is done through the restriction of the amount of Margin allotted to each one. The Margin Balance delegated to these positions are amenable to being adjusted individually.
Should the position of a trader be liquidated in Isolated Margin mode rather than the whole Margin Balance, it is the Isolated Margin balance that is effectively liquidated.
Should a position in a Isolated Margin be closed to being liquidated, it can be hindered through the allotment of additional margin to the position.