Citizen science is expanding worldwide due to advancements in technology and increased public involvement in research. Volunteers assist scientists by collecting vital data over large geographic areas and extended periods. In tourism, participants engage in activities like coral planting, wildlife tracking, and environmental DNA collection. Crowdsourced data helps monitor climate change, watersheds, and disaster preparedness. Despite challenges such as data quality, reliability, bias, and institutional hesitation, combining volunteer efforts with professional expertise effectively bridges data gaps in environmental research.