Engrams are theoretical representations of memories stored in the brain. They are thought to be physical changes in the neural pathways that occur when we learn or experience something new. This concept suggests that memories are not just abstract ideas but have a tangible basis in the structure of the brain. The term "engram" was first introduced by the psychologist Richard Semon in the early 20th century. While the exact nature of engrams is still a subject of research, scientists believe they play a crucial role in how we recall past experiences and learn new information, linking them to the broader field of neuroscience.