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Abstraction is a key pillar in computer science theory and particularly object orientated programming.
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
Suggested Videos
www.teachyourselfpython.com