What is Emtree? If you spend any amount of time with Embase, you will see the term often. Emtree is similar to the MeSH terms that PubMed/MEDLINE uses, but is specific to Embase (and was actually modeled on MEDLINE's system). Like a tree, Emtree is a series of branching keywords, all connected in a vast network of synonyms and proximal words used to form the backbone of any search you're doing within the database. Having a thorough understanding of Emtree and how it connects all of Embase will give you an advantage when trying to form complex search queries. For an incredibly detailed look at the differences between MeSH terms and Embase see Elsevier's white paper comparing the two.
Looking at the image below, we can see that the word "diabetes," when used within the Emtree query builder, shows us all the different branches that the term "diabetes" is linked to. You can then click on any one of those options to further extend your search.
If we click on an option, in this case "non insulin dependent diabetes mellitus," we can actually view the branch of linking terms, and from there the options are endless for how one can refine and hone down an article search.
While using the Emtree is not strictly necessary for utilizing the Embase database and all of its features, knowing that the Emtree exists within every search you do, and that you can then use the branches to limit your search results and find different results, is key to finding what you really need.