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Abstraction
Abstraction is a key pillar in computer science theory and particularly object orientated programming. Abstraction is one of the four cornerstones of Computer Science. ... Abstraction is the process of filtering out – ignoring - the characteristics of patterns that we don't need in order to concentrate on those that we do. It is also the filtering out of specific details.
Presentation on Abstraction
Further reading and articles
https://en.wikipedia.org/wiki/Abstraction_(computer_science)
https://www.w3schools.com/java/java_abstract.asp
https://www.bbc.co.uk/bitesize/guides/zttrcdm/revision/1