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Each method had its own advantages, and the choice of whether to add a new keyword or to create a new collection should be based upon the future use of the word in question. When should you be using keywords in preference to Collections? The choice isn't necessarily clear-cut, however a well organised library will probably use both keywords and collections.
![using nik collection in lightroom using nik collection in lightroom](https://i.ytimg.com/vi/pl4hCzK35Gk/hqdefault.jpg)
To help those who remain confused, I thought I'd try to to explain my take on the differences, with respect the Lightroom's approach. With the release of Lightroom, these two organisational tools have been introduced to many people who haven't as of yet embraced the possibilites of Digital Asset Management.
![using nik collection in lightroom using nik collection in lightroom](https://www.amateurphotographer.co.uk/export/highlight-boxout-4-630x355.jpg)
Some tools implements Collections significantly better than others. Various DAM tools have the concept of both keywords and "Collections" (although each tool has its own name for collections iMatch, for example, calls them categories).