What are user exits? What are customer exits?

SAP Reports,SAP DB,ALE, SAP Tables questions and answers

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What are user exits? What are customer exits?

User exits and customer exits are the same thing.
Both are used to give the customer the chance to influence the outcome of a process(-step) in some way, without having to change the standard SAP software. For example: if an order is entered in the system, availability checks, credit checks etc. could be performed by the system but just before writing the order to the database, the program runs a user exit. In this user exit, your code could change some fields in the order or write an entry in a table that you created for some reason.

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