OSPF uses different LSA types for different purposes:
Type (Router LSA): Every router generates one. Lists all links within an area.
Type (Network LSA): Generated by the DR on broadcast networks. Lists all routers on that network.
Type (Summary LSA): Generated by ABRs. Advertises routes from one area to another.
Type (ASBR Summary): Generated by ABRs. Advertises the path to an ASBR.
Type (External LSA): Generated by ASBRs. Advertises routes redistributed from outside OSPF.
Types and stay within an area. Types , , and cross area boundaries.