Short-term memory (STM)

Is also known as working or active memory.  It holds the information you are currently thinking about.  This information will quickly be forgotten unless you make a conscious effort to retain it.  Like sensory memory,  short-term memory holds information temporarily,  pending further processing.  However,  unlike sensory memory which holds the complete image received by your senses short-term memory only stores your interpretation of the image.

Short-term memory holds information you are actively thinking about.  It lasts for a very brief time (less than a minute)  and can only hold 7+/- 2 pieces of information at once.

Activity: word search puzzle
https://www.educaplay.com/es/recursoseducativos/2805114/short_term_memory.htm

In the following link you can find more information on the subject: http://thepeakperformancecenter.com/educational-learning/learning/memory/stages-of-memory/