Messaging applications have evolved from simple text-based services to sophisticated platforms that are integral to industries ranging from eCommerce to live events, surpassing social networks in monthly users. This evolution has driven the need for chat apps to have a set of core features, such as real-time messaging, message storage, and user privacy controls, while also incorporating innovative functionalities to stand out in a crowded market. Advanced features such as programmability, geolocation, eCommerce integration, and AI-powered chatbots are redefining communication by enabling event-driven interactions, real-time delivery tracking, and automated customer service. Additionally, the integration of APIs and moderation tools enhances user experience and ensures secure, efficient communication. As chat continues to be a central element in digital interaction, developers are encouraged to utilize accessible technologies like APIs and SDKs to build scalable and engaging chat applications, leveraging new resources such as the Chat Resource Center for guidance.