Photobiomodulation (PBM), also known as low-level laser therapy (LLLT) or red light therapy (RLT), is a non-invasive, light therapy treatment that uses specific wavelengths of light to stimulate collagen production, skin and joint healing, reduce inflammation, promote muscle recovery and relieve pain. It involves exposing the skin to low levels of red or near-infrared light, which is absorbed by cells and triggers various biological processes.