What are some key features of WhatsApp that make it a popular messaging app?
WhatsApp 有哪些主要功能使其成为流行的信息应用程序？
WhatsApp offers free messaging and voice/video calls regardless of location, a user-friendly interface with various customization options, and end-to-end encryption for enhanced privacy.
无论身处何地，WhatsApp 都能提供免费的信息和语音/视频通话服务，用户界面友好，提供各种定制选项，端到端加密可增强隐私保护。