Privacy and security are distinct concepts; privacy concerns identifiable information, while security relates to data vulnerability. Protecting privacy is essential due to the interest of companies in harvesting data. Reliable messaging apps use end-to-end encryption (E2EE) to secure messages, with varying implementations. Apps like Briar and Session operate on decentralized networks and prioritize user privacy, while Signal, Telegram, and WhatsApp have different levels of security features. Signal and WhatsApp provide E2EE for personal chats, but Telegram only offers it for "Secret Chats." Business accounts on WhatsApp lack encryption. Signal is a nonprofit that does not sell user data, while Telegram operates for profit and has faced criticism for privacy enforcement. Briar and Session allow anonymous communication without personal data. Law enforcement can access messages through various methods, but apps like Signal and Telegram are resistant to inquiries. WhatsApp is the most widely used app, while Telegram and WhatsApp offer more social features but come with risks. All three services support voice and video calling, with varying reliability. Signal is highlighted as the best option due to its strong encryption and commitment to user privacy.