The presenter in the YouTube video titled "How to Use Top Command in Linux" demonstrates the use of the top command as a task manager in the Linux operating system. This command provides real-time system information, displaying the current time, system status, and various metrics. Metrics include the system load (minimum, maximum, and average), the number of running tasks and their states (sleeping or running), CPU load, memory usage (total and free), and swap memory usage. The top command also shows the process ID (PID), user running the process, memory and CPU consumption, and the time the process has been running and the command being executed for each process.