Banners officially exist in the PC version of Minecraft. This addon introduces a few such flags in our favorite Minecraft Pocket Edition. Of course, the function of the banners is much more limited, but You can still try out and test all the flags. Perhaps You never had a chance to deal with them, then this is a great way to come and see it.  the resource is just a concept. The developer hopes that in the future the flags will be put into the official build pocket edition.