A preprint repository is an online platform where researchers can share their academic papers before they undergo formal peer review. This allows scientists to disseminate their findings quickly and receive feedback from the community. Preprints are often used in fields like biology, physics, and social sciences to promote collaboration and transparency. These repositories help accelerate the pace of research by making new ideas and results accessible to others. Popular preprint repositories include arXiv for physics and mathematics, and bioRxiv for biology. By sharing their work early, researchers can engage with peers and refine their studies based on community input.