Mini display port is simply a smaller version of the display port, mini display port is mainly used on MAC computers but other manufacturers may adopt this type of connector.
The mini display port to HDMI adaptor will allow you to connect a high definition monitor, projector or LCD TV to a MacBook, MacBook Pro or a MacBook Air with a mini display port connection. Note that this requires an additional HDMI cable.
Supports mini displayPort 1.1a and HDMI 1.3b output
Supports HDMI resolution of 1080p
Supports HDMI 225Mhz/2.25Gbps per channel (6.75Gbps total)
Supports HDMI 12-bit per channel (36-bit total) deep colour
Supports uncompressed audio such LPCM (on suitable systems)
Supports compressed audio such as DTS Digital, Dolby (on suitable systems)
Digital including DTS-HD and dolby true HD
Powered by display port (on suitable systems)