The document discusses the challenges and advancements in using big data analytics for cybersecurity, highlighting that while perimeter defenses are crucial, they cannot stop all threats. As sophisticated attacks evolve, companies increasingly rely on forensic tools and security analytics to detect and respond to these threats through detailed analysis of data. However, the use of big data in security remains a developing field, with many organizations still grappling with the vast amounts of data and the necessary technologies for effective analysis.