Retrieval practice is the act of retrieving something from your memory (often with the help of a cue).
Recent research has shown that retrieval is critical for robust, durable, long-term learning. Every time a memory is retrieved, that memory becomes more accessible in the future. Retrieval also helps us create coherent and integrated mental representations of complex concepts, the kind of deep learning necessary to solve new problems and draw new inferences.
A really useful starting point to understand retrieval practice, interleaving and spacing can be found here.
At Crawford Village, our pupils are given 'Sticky Skills' tasks, each with an expanded interval of time for retrieval information; this creates a deeper level of processing of the learned content in long term memory at each point.