VGA and HDMI are interface standards used for cables that connect devices — such as laptop computers and DVD players — to a display, like a TV, computer monitor or projector.
VGA is an older standard that carries only a video signal. HDMI is the default cable standard for newer electronic devices, such as Blu-Ray players or LED TVs. HDMI can carry both digital video and audio signals, all while encrypting data with HDCP.
The video quality attained with a VGA cable is noticeably worse when compared to that of HDMI. Even so, HDMI may be phased out soon, as USB 3.1's versatile Type-C connector has the potential to replace the HDMI standard.