Brick-and-mortar retail is a physical location, like a store, where transactions occur. This term is used in opposition to "online retail" and e-commerce.
There are endless articles about "the end of retail" (a.k.a. "the end of brick-and-mortar"). A popular theory is that brick-and-mortar is done, and headlines predict a future without stores, supported by numbers of big chains closing stores. Many experts agree, though: brick-and-mortar is not dead, it is evolving.