Long-term memory refers to the stage of memory in which knowledge and information are stored indefinitely. It involves the transfer of information from short-term memory into long-term storage, creating enduring memories. Long-term memory is essential for retaining past events, knowledge, and skills over a long period of time, sometimes even for a lifetime. There are two types of long-term memory: declarative or explicit memory, which is information that can be consciously recalled, and non-declarative or implicit memory, which is knowledge that is retrieved unconsciously. The process of long-term memory involves three phases: acquisition, storage, and retrieval. Overall, long-term memory plays a crucial role in our ability to remember and learn from past experiences.