Which type of memory is described as having unlimited storage for long periods?

Long-term memory is characterized by its ability to store vast amounts of information for extended periods, potentially throughout an individual's entire lifetime. This type of memory is not limited in capacity, allowing for the retention of various types of information, such as facts, experiences, and skills. It is where information becomes consolidated after it has been encoded, often through processes such as rehearsal and elaboration.

In contrast to long-term memory, short-term memory has a limited capacity and duration, typically holding information for only about 20 to 30 seconds. Working memory is a more specific form of short-term memory that focuses on the manipulation of information for cognitive tasks, necessitating active engagement and support for tasks like problem-solving or reasoning. Immediate memory, while related to short-term recall, pertains to transient retention of information just encountered, lasting only a few seconds.

These distinctions help clarify why long-term memory is noted for its expansive storage capabilities over long durations, making it essential for learning, personal history, and the accumulation of knowledge.