Poshmark operates as a social commerce platform specializing in fashion retail, positioning itself as a leading marketplace for both new and pre-owned clothing items. The application facilitates peer-to-peer transactions across diverse categories including women's, men's, and children's apparel, plus home goods, featuring inventory from over 9,000 brands ranging from mass-market retailers to luxury designers. The platform's core functionality centers on its streamlined listing process, which allows sellers to photograph items, set prices, and manage inventory through an intuitive mobile interface. Buyers benefit from advanced search filters, brand categorization, and a social feed that displays recently listed items. The integrated payment system handles transactions securely while providing prepaid shipping labels, simplifying the logistics typically associated with peer-to-peer sales. User experience demonstrates thoughtful design with a clean, visually-oriented interface that emphasizes product imagery. The app incorporates social features including following other users, sharing listings, and participating in virtual "Posh Parties" - timed shopping events that boost item visibility. Real-world usage patterns show most transactions occur through mobile devices, with sellers typically spending 2-3 minutes creating listings and buyers frequently browsing during commute times or evening hours. User feedback indicates generally positive experiences, though some operational limitations emerge. Libby Brooks noted on July 21, 2025 that inactive seller accounts clutter search results, creating frustration when desired items prove unavailable. Lauren Kozen's June 16, 2025 review highlighted the platform's ease of use and income potential for casual sellers. Angela Graves' June 21, 2025 comment mentioned occasional fulfillment issues with bundle orders where missing items weren't refunded. The application demonstrates particular strength in creating accessible fashion resale markets, though limitations include dependency on seller responsiveness and occasional inventory accuracy issues. Ideal use cases involve fashion enthusiasts seeking specific items at discounted prices, plus individuals looking to monetize unworn wardrobe items without managing complex e-commerce logistics.