VGA cables, or Video Graphics Array cables, are used to connect computers to monitors or projectors. They transmit video signals in analog format, allowing for the display of images and videos. VGA connectors typically have 15 pins arranged in three rows, which help ensure a stable connection. Although VGA technology has been around since the late 1980s, it has largely been replaced by digital connections like HDMI and DisplayPort. However, VGA is still found in some older devices and is valued for its simplicity and compatibility with various display equipment.