Which memory system has an unlimited capacity and can keep information for hours or decades?

Memory system has an unlimited capacity and can keep information for hours or decades is called long term memory. Long term memory is defined as a system in which information can be stored permanently, manage and retrieve for later use. Long term memory is divided into three main parts; these are procedural, sematic and episodic memory. Procedural memory is accountable for knowing how to do things, though it doesn’t now include conscious thoughts. While, sematic memory is responsible for the general knowledge that includes knowing about the word’s meaning. Lastly, the episodic memory in which it involves conscious thoughts thus it is responsible for storing information about the various happenings in human life.