DHCP (Dynamic Host Configuration Protocol) Server Settings are commonly found on broadband router firmware. The DHCP section is where you can configure the router's built-in DHCP Server to assign IP addresses to the computers and other devices on your local area network (LAN). Other DHCP options include Enable DHCP Server and Add or Edit DHCP Reservation.
See "Common Router Settings" in the Quick Reference section of Webopedia.
See also Webopedia's "Did You Know… Routers, Switches and Hubs: What's the Difference?"