Why FND in Oracle apps??

FND stands for Foundation!!

FND means Foundation. It means, this is the schema where all the foundation/"apps tech stack" tables are created.

For example, following entities can be classified as Foundation to apps.

1. Apps Security related tables, to name a few FND_USER, FND_RESPONSIBILITY, FND_SECURITY_GROUPS, fnd_application etc...


2. Apps validation related tables.
i.e. FND_FLEX_VALUES, FND_FLEX_VALIDATION_EVENTS, FND_FLEX_VALUE_SETS, fnd_lookups, FND_LOOKUP_VALUES 

3. All the workflow related tables.

4. Concurrent manager related tables.
i.e. fnd_concurrent_requests, fnd_concurrent_programs

5. Apps standard API packages i.e. FND_SEQNUM.assign_doc_seq, fnd_global.user_id, fnd_file.put_line