OSPF is Interior Gateway Protocol (IGP) designed to distribute routing information between routers belonging to the same Autonomous System (AS).
https://help.mikrotik.com/docs/display/ROS/OSPF
The protocol is based on link-state technology that has several advantages over distance-vector protocols such as RIP:
no hop count limitations;
multicast addressing is used to send routing information updates;
updates are sent only when network topology changes occur;
the logical definition of networks where routers are divided into areas
transfers and tags external routes injected into AS.
