An immigration bond is, in essence, a way for ICE, the immigration courts, and other government agencies to ensure that immigrants will return to court for the proceedings in their case. In addition, it is a way to guarantee that they can be trusted if they are released from custody while they await their proceedings. This is one reason why these bonds require the individual paying them to be a citizen or lawful permanent resident.
Getting a bond does not affect the outcome of the case. It does not affect the charges or the proceedings. However, it does allow the immigrant to leave the jail and go home to be with their family during this time, as long as they follow the conditions of their release.
This also allows the immigrant to better work with an immigration law firm or attorney to obtain legal status, build a case to argue against removal, get a cancellation of removal, or take other steps to get a better outcome in their case.