I am quite new to metagenomics. I have been looking at different classifiers and had a question regarding one of the terms I have come across when reading papers that evaluate classifiers. What does "assembly-level" classification mean? I understand genus-level classification and species-level classification but am not sure what "assembly-level" classification is referring to.
For context, here is the quote from the reference:
"TaxSBP supports one level of specialization after the leaf nodes of the tree, making it possible to further cluster sequences by strain or assembly information that is not directly contained in the NCBI Taxonomy database."