High Q-factors lead to more efficient resonances, resulting in stronger interactions with light. Key effects include enhanced light-matter interaction, narrowband filtering and sensing, strong near-field effects, reduced losses in plasmonic devices, subwavelength resolution in imaging, and directional and tunable light emission. However, challenges with losses in the visible regime include inherent material losses in metals, particularly gold and silver, which can reduce the Q-factor, causing a trade-off between strong resonances and system efficiency. Researchers are exploring materials with low-loss plasmonic materials and designing hybrid metasurfaces that combine high Q-factors with low-loss materials.