What is the definition or description of: short term memory loss?

Memory types: Short term memory literally holds memories for approximately 30 seconds unless we use strategies like "chunking" for phone numbers to help us retain the memory for a few seconds longer. Long term memory goes through a process called "long-term potentialisation" where the memory is stored in the hippocampus and other areas..Thats the reason why short -term memories are more susceptible to loss