What is the word that means, "using ideas to represent lower layers of detail"? and why is it so important in computer science?

Jason works as an accountant in a department store. he needs to keep a daily record of all the invoices issued by the store. which file naming convention would him the most? a)give the file a unique name b)name the file in yymmdd format c)use descriptive name while naming the files d)use capital letters while naming the file

What is a scenario where records stored in a computer frequently need to be checked

Effective character encoding requires standardized code. compatible browsers. common languages. identical operating systems.