A "network doctor" is a professional who specializes in diagnosing and fixing issues within computer networks. They ensure that all devices, such as computers and servers, communicate effectively and securely. Their work often involves troubleshooting problems, optimizing performance, and implementing security measures to protect data. These experts typically have a background in information technology and may hold certifications related to networking, such as those from Cisco or CompTIA. By maintaining the health of a network, they help organizations operate smoothly and efficiently, minimizing downtime and enhancing productivity.