hey
The information collected from an observation is called data.
Bases are not called alkalis. Alkalis are a specific subset of bases that are soluble in water. All alkalis are bases, but not all bases are alkalis.
Data about data are called metadata. See the related question "What are metadata?" for more details.
3
From where do you want to access.
I think file is a open structure. and the data base is closed structure.
Experiments, books, scientific articles, encyclopedia, catalogs, data bases, etc.
Doctors
it means file
This piece of data is called an "argument".
its called data redundancy.