Collection
A named grouping of images assembled for a purpose, independent of where the files are stored.
Measured in
count
In depth
Collections separate organisation from storage: one frame can belong to a client delivery, a portfolio and a book project at once without being copied. This is why folder structure should reflect capture — by date and shoot — while collections handle every other way of grouping.
Examples in practice
A single portrait appears in a client gallery, a website portfolio and an exhibition selection without duplication.