Textile formatting is used in numerous wiki applications and other places where easy formatting is needed for text input fields without using a WYSIWYG interface. Currently I am using textile a bunch because I spend at least some time every day adding tickets, updating tickets, and adding/modifying wiki pages in Redmine. In Redmine you have the option of using Textile formatting or no formatting by default. If anyone is on the fence regarding Textile formatting I suggest you give it a chance as it grows on you after a short amount of time.
There are a couple different ways to outline each cell within a table created using textile. Below I will explain two options available to put a border around each cell. First lets explain how to create a basic table of cell provider email addresses using Textile.