What is "GO slimming" ?

FAQ tags: 
Mapping granular annotations of a set of genes to one or more high-level, broader parent terms is referred to as "GO slimming". GO slimming is commonly used to report an overview of a genome or to a set of summarize experimental results. GO hosts a number of predefined Slim sets, a generic GO slim, and a number of slims tailored to give good coverage for some well studied/annotated model species. GO slimming will only be successful if the organism of interest has a body of GO annotation in the GO database (either electronic or manual). If your organism of interest has no publicly available GO data refer to the FAQ to annotate a gene set <>