What measures are implemented to protect applications from external threats?

Application Security encompasses a set of measures and practices aimed at protecting applications from external threats, such as attacks or unauthorized access. These measures can include techniques like secure coding practices, regular software updates, vulnerability assessments, and employing application firewalls. The goal of Application Security is to identify, fix, and prevent security vulnerabilities in software applications throughout their lifecycle.

In contrast, the other options focus on different aspects of technology. Geospatial Technology Trends involve the evolving advancements and methodologies in geospatial systems rather than security measures. Systems Architecture pertains to the structural design of systems and how different components interact, which, while important for function, doesn't specifically address security against external threats. GIS Software refers to tools and platforms used for geographic information system analysis and visualization, which also do not inherently focus on the protective measures necessary against external threats. Thus, Application Security is the most appropriate choice for safeguarding applications from external threats.