Hi Dear,
ABR Routers (Area Boarder Routers): ABR Routers are routers that are positioned on the boundaries of each Area and connect to several OSPF areas. ABR Routers are in charge of summarizing each area's IP addresses and suppressing updates between areas in order to prevent fault containment.
ASBR (Autonomous System Boundary Router): ASBR is an acronym for Autonomous System Boundary Router. A router with interfaces connected to one or more OSPF areas is known as an ASBR.
For further detail of ABR is provided in below link
https://forum.huawei.com/enterprise/en/ospf/thread/655645-861Hope it will helpful