why biofilms are known as an essential part of 'healing and sealing' of your gut?

A biofilm is any group of microorganism in which cells stick to each other on a surface. these adherant cells are frequently embedded within a self - produced matrix of Extracellular Polymeric Substance ( E P S ) .
Gut is filled with beneficial microflora,the biofilm that they create is thin mucus.this healthy biofilm allows the passage of nutrients through the intestinal wall.Healthy gut biofilm has a role in moistening,lubricating,and in anti-inflammatory actions.