Answer Posted / prasanthi

In SAP R/3 system, 3 main types of interfaces are
System Interface,User Interface and Communications Interface.

In OOABAP, above two local and global.

But in ABAP, Outbound and Inbound Interfaces.
Outbound Interfaces - Retrieving data from SAP and sending
to other systems.
Inbound Interfaces - Sending data from other system to SAP.
Example:
Outbound interface is used to send IDocs to the ALE server.
Inbound interface is used to analyze the received Idoc.

Check this link.

http://help.sap.com/saphelp_nw04/helpdata/en/cd/0b733cb7d61952e10000000a11405a/content.htm

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