E-commerce involves online business transactions and digital delivery of products and services. For contracts formed online, issues include offer/acceptance, intention to contract, consideration, capacity and consent. The Electronic Transactions Act validates electronic transactions and signatures, and sets rules for record keeping and time/place of electronic communications. When setting up a business, options include sole trader, partnership, company or trust structures, with factors like liability, control, and costs to consider. Domain names identify businesses online and are administered globally, with country-specific rules like Australia's auDA for .au domains.