Zalo is a popular messaging and video calling app in Vietnam. It allows users to send free messages, make video calls, and share photos, videos, and documents. It is convenient and fast, so users can connect with others instantly. Moreover, Zalo is easy to use because it has a simple design, and it is suitable for people of all ages. Besides, it is free if there is an internet connection, and it also offers many useful features such as money transfer, location sharing, and group chats. However, Zalo also has some disadvantages. It can be time-consuming because users may spend too much time chatting. There are also security risks, so personal information may be exposed if users are not careful. In addition, Zalo needs an internet connection to work. In the future, people will probably continue to use Zalo because technology is developing, and it is very useful for communication and work.