Final Answer:
Tom Marvolo, also known as Lord Voldemort, communicated with Harry primarily through a telepathic connection known as "Legilimency" in the Harry Potter series.
Step-by-step explanation:
In J.K. Rowling's Harry Potter series, Tom Marvolo Riddle, later known as Lord Voldemort, possesses the magical ability of Legilimency. Legilimency is a skill in the wizarding world that allows one to delve into the minds of others, enabling the Legilimens to perceive thoughts and emotions. Voldemort, being a highly skilled Legilimens, used this power to establish a mental connection with Harry Potter. This connection allowed Voldemort to communicate with Harry, invade his thoughts, and even manipulate his emotions to some extent.
The telepathic link between Voldemort and Harry is particularly prominent in the fifth book, "Harry Potter and the Order of the Phoenix." This connection is inadvertently formed when Voldemort unsuccessfully attempts to use the Killing Curse on baby Harry, resulting in a fragment of Voldemort's soul attaching itself to Harry. As a result, Harry becomes a inadvertent Horcrux, and this connection facilitates the mental communication between the two characters. Throughout the series, this link becomes a crucial element in the overarching narrative, contributing to the complexity of Harry's relationship with Voldemort.
In conclusion, Tom Marvolo, or Lord Voldemort, communicated with Harry through the magical skill of Legilimency, establishing a telepathic connection that played a significant role in the unfolding events of the Harry Potter series. This connection added layers of depth and tension to the narrative, showcasing the intricacies of the magical world created by J.K. Rowling.