Bricks and mortar is an expression mainly used in the earlier years of E-commerce for referring to "old" businesses that possesses physical stores.
The bricks and mortar term is usually used to contrast the assumed agility of Internet pure players.
For instance the Barnes and Nobles bricks and mortar is frequently opposed to the Amazon pure player.
Pure players are, of course, considered as a threat to bricks and mortars.
Actually, most bricks and mortars became clicks and bricks.