Elon Musk said the satellites had laser transmitters that provide communication between satellites as well as allow for Internet access from any place on Earth. Switching to laser communications can improve the speed of data transfers and help eliminate the need to have ground stations.
Currently, the Starlink satellite Internet network works according to the "user → satellite → ground station" model. To operate the network, SpaceX builds or leases ground stations.
This works well but also has its drawbacks. The communication with satellites may be slow or unstable over the oceans and in polar regions, affecting Internet speed and quality.
Laser communication can solve this problem since it will allow transmitting a signal to ground stations that are too far from the satellite using the neighboring satellites as repeaters.
The company says that all future Starlink satellites will be able to transmit signals through its global satellite network using laser links.