Memory is our ability to store and later recall our experiences. It is essential to our survival as it enables us to adapt our current and future behaviour based on what we have learnt in the past. Learning can therefore be thought of as the process of laying down memories that may be useful in the future. There appears to be no limit to the amount of memories that can be permanently stored in the human brain but that doesn't mean that we remember everything. Nor would we want to! In fact, we only permanently store a very small amount of our daily memories. Most things are discarded as unimportant, particularly routine and familiar experiences. Even things we want to remember are often forgotten and this is explored below. There are a number of different specialist memory components suggested by researchers but, for the purpose of this article, we will limit ourselves to a description of memory in the short, medium and long term.