Vendor profiles are sets of DHCP options required by particular devices. For example, a VoIP phone might need a very specific set of DHCP options.
A vendor profile is the container in which the DHCP vendor options are stored. A single vendor profile contains several DHCP vendor options, all of which can be sent to a specific type of device such as an IP handset. After the vendor profile is created and populated with the appropriate options, the options themselves can be defined and set at the appropriate level.