connecting to router or switch console if serial port is not available in computer

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In the modern time most of  computer or laptop have no serial port . The new Computers or laptops the serial port replaced by Universal Serial Bus (USB) ports.
The  console port of switch or Router to make communication between the router or switch with system .You will need to use USB to Serial Adapter.The USB to Serial adapter may not be plug-and-play. You need to install the corresponding drivers also for these adapters. A typical USB to Serial adapter with console cable is shown below.