Zalo is a popular messaging and video calling app in Vietnam. It allows users to send free messages, make video calls, share photos, videos, and documents, moreover it is convenient and fast because Zalo helps users connect instantly via text messages and video calls. Besides, Zalo is easy to use with a simple design, making it suitable for all ages, and messages and video calls are free if there is an internet connection, so Zalo offers many useful features such as money transfers, location sharing, and group chats. However, it also has disadvantages because it can be time-consuming when users get caught up in unnecessary conversations, moreover there are security risks as personal data may be exposed if not used carefully, and Zalo requires an internet connection to function. Therefore, in the future, with the ongoing development of technology and social media, Zalo will likely continue to be widely used, especially for communication and work.