The unique features of e-commerce include global reach, 24/7 accessibility, personalization, and convenience.

The primary e-commerce business models include: Business-to-Consumer (B2C), Business-to-Business (B2B), Consumer-to-Consumer (C2C), Consumer-to-Business (C2B).

E-commerce has significantly impacted business-to-business (B2B) transactions by making them more efficient, transparent, and accessible, allowing for faster order processing, improved inventory management, streamlined communication, and wider market reach.

M-commerce, or mobile commerce, plays a crucial role in business by allowing customers to buy and sell goods and services directly through their mobile devices.

When building an e-commerce presence, key issues to address include: website security and data privacy, payment gateway integration, mobile responsiveness, clear return and refund policies, customer experience optimization, competitive analysis, target audience identification, search engine optimization (SEO), shopping cart functionality, and building trust with customers through verified security measures; all while ensuring compliance with relevant legal regulations regarding data protection and privacy.