Difference between AIS and LRIT || Bridge equipments ||

What do you mean by AIS ?
WHAT is LRIT ? Difference between AIS and LRIT ? RANGE OF AIS AND LRIT ?
AIS - AUTOMATIC IDENTIFICATION AND TRACKING .
LRIT - LONG RANGE IDENTIFICATION AND TRACKING .
LRIT DATA IS SECURED AND OWNED BY FLAG STATE WHILE AIS DATA IS PUBLICLY AVAILABLE . AIS SENDS VHF SIGNAL .LRIT SENDS SIGNAL VIA SATELLITE .