Hi Brajesh,
ALE u2013 Application Link Enabling is a mechanism by which SAP systems communicate with each other and with non-SAP EDI subsystems. Thus it helps integration of distributed systems. It supports fail-safe delivery which implies that sender system does not have to worry about message not reaching the source due to unavoidable situations. ALE can be used for migration and maintenance of master data as well as for exchanging transactional data.
ALE has three prime entities, which participate in the message exchange process:
u2022 SAP R/3 system
u2022 ALE converter (inclusive of its sub-components)
u2022 External non SAP R/3 system
IDocs:
u2022 IDocs (Intermediate Documents) are the crux of ALE. These are the documents with the help of which data is exchanged between SAP R/3 and non-R/3 systems. As the name suggests, these documents act as intermediate storage of information, which can be sent bi-directionally. Message types are responsible for creation of Idocs.
In the below link you will get information from BASIC to ADVANCED
http://wiki.sdn.sap.com/wiki/display/ABAP/ALEandIDocs
Hope it helps you.
Regards,
Sats.
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