Blockchain in ecommerce enhances transparency, security, and efficiency in online transactions. By utilizing decentralized ledger technology, blockchain ensures secure payments, reduces fraud, and enables faster cross-border transactions. It also allows for traceable supply chains, ensuring product authenticity and reducing counterfeiting. Smart contracts can automate and enforce agreements, streamlining processes like returns and warranties. Blockchain integration in ecommerce fosters trust between buyers and sellers, improving the overall customer experience while lowering operational costs.