Communication apps are mobile applications that allow users to communicate with others through text, voice, or video calls. These apps can be used for personal or professional communication and can include features such as instant messaging, group chats, and file sharing. Popular examples of communication apps include WhatsApp, Zoom, Skype, and Slack. These apps can be used for one-on-one conversations, group calls, and even webinars, conferencing, and remote team collaboration. Some of these apps are free to use, while others may require a subscription or in-app purchase for certain features or additional functionality.