Jeff Archer discusses the importance of IT infrastructure by comparing it to the human body. He notes that just as the body needs vital systems to function, computer systems rely on core infrastructure components like servers, networking, storage and software. Archer stresses the importance of security, monitoring, capacity planning and flexibility when building an IT infrastructure. He outlines how different infrastructure systems can be analogized to parts of the human body, from security as the "skin" to servers as the "brain" and networking as the "circulatory system".