The user is able to access an information pool that contains the memories of one or more persons, enabling them to call on those memories and experiences.
The Ackerman clan (Attack on Titan) possesses a collective memory through the Paths, allowing Levi and Mikasa to connect to every Ackerman before them and gain their battle experience.
Namekians (Dragon Ball series) can access the collective energy, strength, memories, and intelligence or thought patterns of those they fuse with, Piccolo able to do so with Nail and Kami...
...and Saonel and Pilina doing so with the entirety of the Universe 6 Namekian race.
Symbiotes such as Venom (Marvel Comics) can recall information from previous hosts and transfer said information to subsequent ones...
...and also leave behind a "symbiote codex" in previous hosts in order to share information with the rest of their hive.
The Mechanical Guardians (Batman: Arkham City) possess a shared memory pool, allowing Batman to scan their memories and reconstruct a video scene.
All Slayers (Buffy the Vampire Slayer) are able to access the memories and experiences of their predecessors.
While they have individual A.I.s, the Tachikomas (Ghost in the Shell) possess identical consciousnesses that are each the sum of their total collective experience and development, granting them the same memories.
Using the Shadow Clone Jutsu, Naruto Uzumaki (Naruto) can create a collective memory, enabling him to accelerate training periods.