What is the purpose of applying a drywall skim coat and how does it contribute to the overall finish of the wall?

The purpose of applying a drywall skim coat is to create a smooth and even surface on the wall. It helps to cover up imperfections, such as bumps and seams, and provides a uniform base for painting or wallpapering. The skim coat also helps to improve the overall appearance of the wall by giving it a professional and polished finish.