Marketplace Software provides the foundational infrastructure for building and operating multi-vendor commerce platforms — handling seller onboarding, product catalog aggregation, transaction orchestration, and commission/payout management across a two-sided or multi-sided marketplace. Core capabilities include seller registration and vetting workflows, multi-vendor catalog management, search and discovery, order routing and fulfillment coordination, split payments and commission calculation, buyer and seller dashboards, rating and review systems, and integration with payment processors, logistics providers, and compliance tools. The category spans marketplace infrastructure platforms (Mirakl, Sharetribe, Arcadier, Nautical Commerce) and commerce platforms with marketplace extensions (Shopify marketplace apps, BigCommerce multi-vendor).