This chapter discusses vendors, purchases, and payments in Peachtree accounting software. It introduces two sample businesses - Cynthia's Service Merchandise and a sole proprietorship. The chapter covers entering purchase invoices, returns, and payments. Key tasks covered include setting up vendors, entering purchases in the purchase journal, recording returns, and making payments in the payments window. Important terms defined include accounts payable, vendor ledgers, purchase journal, and cash disbursements journal. The chapter also discusses inventory costing methods and includes practice exercises to apply the concepts.