Hyperchat

Nowadays one cannot imagine life between the stars without Hyperchat, allowing us to find out all the latest gossip and watch telenovellas inbetween shifts on the mining rigs. But it took a long time to develop and improve this technology. Now that it's here, it has changed the face of warfare. Gone are the days that calling for reinforcements could take weeks, if the messenger even made it.
But it's not just warfare that changed, it also has helped connect us. One can keep in touch with friends and family, even if they are over a hundred lightyears away. Entertainment, information, receiving a recording of your child's first play while you're gathering dark matter. Sharing research info, so that an exploration doesn't have to physically return first. And of course lots of espionage.

Money makes the world go round

Of course we still face plenty of restraints. It is far easier to receive than to send, so smaller bases still depend on bigger locations to send out their responses. The more data you want to send, the more expensive it will be. A semi-live video connection is a billion times more expensive than sending out a letter, moreso if you need the message sent over repeaters or to multiple destinations.
Which is of course where the money comes in. Multiple Corps make a living in supporting Hyperchat relay networks, while smaller groups then send the signals on to very specific desired locations. Most Corps use their own networks, but your average employee will still use the public systems. Media mastercopies also use these networks, then get distributed in cheaper ways at its destination.

The Science-y bits

Without going into the finer details, Hyperchat signals are basically beams of energy sent through the Hypersea, with the actual information encoded into fluctuations and frequencies and whatnot. It also needs a lot of extra bandwidth to handle any corrupted data, because while space may be a vacuum, the Hypersea isn't. Plenty of things that can disturb your signal.
Due to being narrow, the main beams have to precisely target their receivers. While most messages are encrypted, they come with identifiers who to send them to, so receivers know where to forward the signal to. This process also involves error-correction, so that the message receives correct throughout its long ride across the galaxy.
When addressing a ship, one first needs to indicate the overall direction. After reaching a Hyperbase in the right area, said Hyperbase will have sensors capable of knowing where the ship is. This lets them target the specific ship, which will use its general sensors to receive the message. When it comes to targeting anything in normal space, we need a Hyperchat Tower to receive the message.