Plasmonic nanoparticles are powerful nanoantennas tunable into the UV to IR spectral range, and the energy deposited in their resonant modes can drive local physical and chemical transformations in their surroundings. As such, they are often present in strategies designing nanocomposites for photocatalysis. Excited charge carrier (electrons or holes) injection is one of the most relevant mechanism through which plasmonic systems can drive photochemistry, allowing a broader spectral sensitization, and supporting redox reactions in particular, but it is not unique. Plasmonic nanoparticles can also exchange energy through purely electromagnetic interaction, as well as creating strong temperature gradients in the nanoscale through the energy in the plasmon ultimately dissipating as heat. This talk will present a general overview of these mechanisms, theoretical models describing them and their properties, and some strategies to favour specific ones through photocatalyst design. This discussion will then be used as the background for exploring how plasmonic nanostructures are being used in studying chirality in the nanoscale through different applications of plasmon-driven photocatalysis.