The main difference between VGA and HDMI video cables and ports is that VGA signal is analog while HDMI is digital. This means that VGA signals transmit information via electrical wave size. HDMI digital signals transmit data in bits of data (on or off) at different frequencies.
HDMI, DisplayPort, VGA and DVI as soon as possible
There are many more differences between the two, which can help you decide which cable and converters you need.
Video Graphics Array (VGA) was the standard video cable for computers when it was first released in 1987 and is easily identified by its blue 15-pin connectors. At the time, the supported resolution was 640×480, but was eventually phased out to Ultra Extended Graphics Array (UXGA) in 2007. UXGA could support 15" monitors with 1600×1200 pixels.
High Definition Multimedia Interface (HDMI) was developed in 2002 and quickly became the new standard for computers. The most important feature that HDMI offered that no other video cable could offer was the ability to transmit audio on the same cable as the video signal. HDMI supports HD video at 1920×1200 pixels and 8 audio channels.
