Poe Dameron's mind was probed telepathically by Kylo Ren, who successfully extracted information.
Second Sight, as the Chiss knew it, or Telepathy, was the capability to transmit and receive information to and from the minds of others, as well as to mentally interact and communicate with other individuals.
Force-users sometimes used the Force to communicate. The use of telepathy could be challenging for a Jedi.
Second Sight was the term used by the Chiss for telepathy. This power usually appeared in young Chiss who were Force-sensitive around the age of ten. As they got older, it faded, along with their other Force powers. When Second Sight was used to touch the mind of another Chiss with the same power, there was a risk that both minds would become lost in each other.
The Setaran species lacked a mouth or other organ for audible speech, so they used telepathy to communicate with other sentients.
During the High Republic Era, Avar Kriss, a Jedi Master, had the unique ability to strengthen the natural Force bonds between Force-sensitives and detect them. This linked the minds of many Jedi through a form of telepathy, allowing those connected to transmit sensations and feelings to each other without words. Kriss used this ability effectively during the Great Hyperspace Disaster, the Battle of Kur, and the destruction of Starlight Beacon.
Saesee Tiin, an Iktotchi Jedi Master, was naturally a very skilled telepath. Mace Windu managed to send a telepathic message to his Jedi space fleet from the catacomb lair of Guattako on Oosalon, a distance of many planets. While on a mission to Mokivj, Anakin Skywalker found himself trapped in a prison cell. Although the Jedi Knight could sense his wife Padmé Amidala's presence, he couldn't communicate with her using his mind. Thrawn believed that Skywalker should be able to do this and encouraged him to try, but Skywalker said it didn't work that way. The Agbui species had a form of telepathy that allowed them to read the emotions and desires of other sentients when they touched them.
When he needed to be rescued on Cloud City, the Jedi Padawan Luke Skywalker used telepathy to call out to his twin sister Leia Organa. Darth Vader also used telepathy to try to convince Luke to join the dark side and to reveal that she was his daughter. Kylo Ren was a skilled telepath who could extract information even from unwilling targets. He could converse with other Force users from light years away, like Supreme Leader Snoke or Palpatine. Snoke had mastered telepathy and it was among his powers.
Vah'nya, a navigator, had Second Sight and used it to connect with the memories of Un'hee, another Chiss who was Force-sensitive. While not true telepaths, the Mahran species could faintly sense the emotions of others. The disembodied B'omarr monks, who existed as bottled brains on spider-like droid legs, communicated telepathically, using a telepath response unit.