The tile wall section consist of applications where we are putting the tile on a veritcal area. It could be a shower, bathroom or kitchen walls, fireplace surrounds plus much more.  Although backsplashes are also wall applications, I have researved a seperate section for them.   The largest challenage with wall applications is that you are always fighting gravity plus many times you have too minimize the differences between three different planes while lining up grout lines.