ThredUp is an online consignment and thrift store that specializes in secondhand clothing. Founded in 2009, it allows users to buy and sell gently used apparel, primarily for women and children. The platform promotes sustainable fashion by encouraging the reuse of clothing, reducing waste, and offering affordable options. Sellers can send their unwanted clothes to ThredUp in a prepaid shipping bag, and the company handles the sorting, photographing, and listing of items. Buyers can browse a wide selection of brands and styles, making it easy to find unique pieces while supporting eco-friendly practices.