What Is the Difference between a Collection and a Source?
Collections and sources are subdivisions of the index. Collections are groups of sources
built around a theme (ex.: Human Resources and R&D collections); whereas, sources are groups of documents from a single repository (ex.:
all documents from the Coveo website). Each collection and source has its own security
permissions, meaning that it is possible to limit their access to subgroups of users.
Example: The
Human Resources collection can be accessed only by HR employees, while the
Salaries source within it can be accessed only by the directors of that department. Example
of the index structure:

Note: Users cannot query a source unless they have access to its parent collection and cannot
query a document unless they have access to its parent source.