Data Integration and API Connectivity involve connecting applications, databases, and external systems to enable seamless data exchange and communication. APIs act as bridges that allow different platforms to share information securely and efficiently. Data integration helps synchronize business data across cloud services, enterprise applications, and third-party tools. This improves workflow automation, operational efficiency, and real-time access to information. Developers use API connectivity to extend application functionality and support scalable system integration. Secure communication protocols help protect sensitive data during transfer. These technologies are essential for modern web, mobile, and enterprise application development.