"e-SPECS for Revit interfaces with Revit's parametric database, instantly updating your project specifications to the requirements of the building model. Insert a wall, door, window, or any other building object into your Revit model and instantly update your project manual with the appropriate specifications. Any changes you make to the designs will automatically be incorporated into the specification manual. And with the click of the mouse, you can access all the other functionality that e-SPECS provides to update your sections on-the-fly, post project notes, review section markups and more."
Basically, e-Specs uses all of those complicated ID numbers and parameters to create and edit your specifications. Linking your office or typical specs with your Revit file makes it easy to update these specs. Additionally, when working in teams, it will allow team members to add comments and redlines into the project manual.