The server should be able to block unauthorized access, a good firewall but still, enable those authorized to have an access. However, there should be security on vulnerable parts of the system that may lead to corruption and easy access to data thieves.
Abstraction comes from two latin words; abs which means away and trahere which mean to draw. From the meaning itself, it is to draw away something from specific objects, individuals, group, etc. In the computer world, a programmer hides all relevant data pertaining to the relevance of a data. It is done to increase efficiency and and reduce complexity.
