This is a Brand New-in-the-Box Goodman/JanitrolCONTROLCIRCUIT BOARD. Part # is PCBAG123 (OEM Replacement for the boards below). Honeywell part is 1068-400.
The control board is the "brain" of your unit, coordinating and executing the operation of other various components by sending voltage when and where needed. A control board is constantly monitoring sensors and safety switches in the unit.