2.Field:-
?A combination of one or more characters is called filed.
?It describe an aspect of a business object or activity.
?A field is identified by field name.
?Data type specifies the type of data that can be stored in the field
?Field size defines the maximum characters that can be stored in a field.
?For example employee_no, name, designation and salary
3.Record:-
“A collection of related fields .”
A student record is a collection of fields about one student. For example her name, address, Ph# ,
4.File:-
“A collection of related records.”A file is also known as data set.
For example an student file is a collection of all students record.
5.Database:-
“A collection of integrated and related files.”
For example collectively personnel file, department file, payroll file 
