Microplastics (MPs) have established complex bidirectional interactions with bacteria, encompassing both mutualism and antagonism. This review advances a unified ‘Stress‐Habitat‐Degradation’ triangular model that systematically integrates three interconnected dimensions: (1) MPs‐induced biotoxic stress on bacterial communities in water, soil, guts and plant tissues; (2) the plastisphere as a colonisation substrate that enriche...