Increase in customer availability, 24/7 availability, and ease of comparison shopping are direct structural advantages of e-commerce. Credibility is not an inherent advantage — it depends on how an individual business manages customer service, security, and trust-building practices, and is not automatically conferred by operating as an e-commerce platform.

Cookies are small files saved on a user's computer, designed to hold a modest amount of data specific to a particular client and website, accessible by the web server or client. They allow the server to deliver pages tailored to a specific user and carry session information across visits; the other options describe malicious actions unrelated to legitimate cookie use.

A digital wallet contains both a software component and an information component — the software provides security and encryption for personal data and transactions. Digital wallets are stored client-side, are easily self-maintained, and are fully compatible with most e-commerce websites, making them the standard tool for electronic transactions both online and at physical stores.

Business to Consumer (B2C) e-commerce allows businesses to sell goods or services directly to consumers without intermediaries, reducing costs and enabling direct interaction with customers. Common examples include online retail stores like Amazon and Flipkart where consumers purchase directly from the company's website.

C2C (Consumer-to-Consumer) e-commerce involves transactions directly between consumers, typically facilitated by a third-party platform — online auctions like eBay are a classic example. The other models — B2B (business to business), B2C (business to consumer), and C2B (consumer to business) — do not primarily involve consumer-to-consumer auction transactions.