Spaced repetition learning is a method of retaining as much information as possible in as short a period of time as possible. The idea behind it is that we all forget information at an exponential rate. However, if one can interrupt the forgetting process we can refresh what we remember and the rate at which we forget it is flattened out.
(Have a look at the chart to the above or the, less colourful but more easily understandable, one below.)
The way this is actually implemented is through either creating your own spaced repetition calendar or you can use apps such as ‘anki’, ‘brainscape’, or many other great flashcard apps out there. Anki, for example, is a flashcard app which automatically, as you answer the questions on either your own or precreated flashcards, sorts your information into easily recalled flashcards (and so it will create a longer space between showing you that flashcard again) or information that you got wrong and was not easily remember (which it will test you on sooner and more frequently.) This method of learning commits information to the long term memory and will help you smash interviews, exams, and seminars because the amount of information you can store, and store for a long time, is dramatically improved.
Try it out and see the changes in your learning!