Adhesion Assisted parts are alternative versions of some parts found in the base "STL" folder that may be difficult for some printers, with weaker than average bed adhesion to print. I'd recommend the Adhesion Assisted versions to everybody, but especially to those who have had issues with poor print bed adhesion in the past. These alternative versions have thin brim like structures that will provide additional support and stability to parts with small islands, making them less likely to topple over while printing. These supports are easy to cut or tear away, and only come into contact with edges that will be hidden after assembly, avoiding any visible blemishes that could be created by a traditional slicer generated brim.