Void Gates functionality was discovered around the year 1500 of the Large Magellan Era. Spacefarers found out that the gates could be used to "Gate Jump" or warp to distant sectors in space, allowing for new discoveries and much faster travels. No one knows who built the Gates and how they are reactivated.
There are two types of Void Gate: those that are operational, and those that are out of service (also referred to as "Dead Gate"). The Dead Gates are treated like ancient ruins and do not appear on CTA's map system.