Text messaging apps have transformed communication by offering enhanced features over traditional SMS, such as group chats, multimedia sharing, and end-to-end encryption. Developers can create these apps on platforms like Android, iOS, and the web, using respective programming languages and technologies such as Java, Kotlin, Swift, Objective-C, JavaScript, or React. These apps are equipped with features like push notifications, read receipts, and file sharing, catering to diverse use cases in industries such as healthcare, customer service, gaming, and social media. PubNub offers APIs and SDKs that assist developers in building robust chat applications by providing tools for features like mobile push notifications, data encryption, and user authentication, ensuring a fast and secure user experience.