Hello Mike
Type 2 LSAs are sent by DRs to all DROTHER (non-DR and non-BDR) routers in a multiaccess network. A multiaccess network is one where you can have multiple routers connected to the same network segment such as in the following topology:
Such a topology requires the election of a DR and a BDR. A DR will accept all Type 1 LSAs from other routers within the specific broadcast domain (not the area mind you but the broadcast domain). It will then compile all the information found in all of those Type 1 LSAs and create a Type 2 LSA. It will then send this out to all of the DROTHER routers in the broadcast domain.
The very purpose of the Type 2 LSA is to be used solely by the DR (and BDR) in a multi-access network environment. Even if you only have two routers connected with each other via an Ethernet connection, they will still have a DR/BDR election and use both Type 1 and Type 2 LSAs just because the Ethernet technology is inherently multiaccess. Conversely, Type 2 LSAs will not be found in any point to point technologies such as serial connections between OSPF routers.
More info about DRs and BDRs can be found here:
I hope this has been helpful!
Laz