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FOLIO is a micro-service system. FOLIO services are called "modules"

Each module is a separate application serving a specific role. There are several roles in project:

Frontend modules ↑

FOLIO frontend is built as an SPA application based on React.js.

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Note
Modules used to interact with third-party systems (where FOLIO is an initiator) can be considered either BL or EDGE modules (example: https://github.com/folio-org/edge-dematic)

Sample interaction diagram

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