Skype was successful due to its low-cost structure, easy user interface, and viral growth. It offered free video calls, chat, and file sharing between users globally. This large community of users provided unused processing power, lowering infrastructure costs. Skype disrupted telecom industries by allowing free or low-cost phone calls internationally. It faced competition from traditional phone providers, VoIP services, and other peer-to-peer communication apps. eBay acquired Skype in 2005 to expand e-commerce opportunities through new markets and payment integration with PayPal. Risks included potential service disruptions impacting eBay's market value.