Acquiring new, or modifying existing, knowledge, behaviours, skills, values, or preferences and may involve synthesizing different types of information. The ability to learn is possessed by humans, animals and some machines. Learning is not compulsory, it is contextual. It does not happen all at once, but builds upon and is shaped by what we already know in relation to the demands encountered. To that end, learning may be viewed as a process, rather than a collection of factual and procedural knowledge.