The DHCP server is usually located on a network server or a router, and it is responsible for managing the assignment of IP addresses to devices on the network. When a device connects to the network, it sends a request for an IP address to the DHCP server. The server then assigns an available IP address to the device, along with the subnet mask, default gateway, and other network configuration settings. The device can then communicate with other devices on the network using this assigned IP address.