PSB Mrówka is a do-it-yourself home-and-garden retail chain for home, repairs, garden and decor, run under the umbrella of Grupa PSB Handel – Poland's largest buying group for building and renovation materials. The Mrówka ("the Ant") format is aimed at everyday household shopping and is deliberately built as a locally owned shop serving its own town or county, rather than an impersonal big-box. It intentionally targets smaller and mid-size towns that large DIY chains ignore, and comes in scalable formats: a compact Express for small towns and a larger classic format with an outdoor garden area for stronger markets.