DHCP (Dynamic Host Configuration Protocol) is a protocol which allows
individual devices on an IP network to get their own network configuration
information (IP address, subnetmask, broadcast address, etc.) from a DHCP
server. The overall purpose of DHCP is to make it easier to administer a
large network. The dhcp package includes the DHCP server and a DHCP relay
agent. You will also need to install the dhcp-client or dhcpcd package,
or pump or dhcpxd, which provides the DHCP client daemon, on client machines.

If you want the DHCP server and/or relay, you will also need to install the
dhcp-server and/or dhcp-relay packages.