C4ISR stands for Command, Control, Communications, Computers, Intelligence, Surveillance, and Reconnaissance. It is a research area that focuses on the integration of technology and systems to enable military forces to effectively gather and share information, make informed decisions, and coordinate actions in real-time. C4ISR systems encompass a wide range of technologies, including sensors, communication networks, data processing and analysis tools, and decision support systems. The goal of C4ISR research is to enhance situational awareness, communication, and coordination among military forces to improve their operational effectiveness and efficiency.