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6. a unique name applied to an item of data.
7. a composite data type comprising several related items that may be of different data types.
8. a numerical indicator of an item of data’s position in an array.
11. a classification attributed to an item of data, which determines the types of value it can take and how it can be used.
13. the index of the last element in an array.

1. a collection of data and a set of operations on that data.
2. a data type constructed using several of the basic data types available in a particular programming language.
3. a collection of data stored by a computer program to be used again.
4. the index of the first element in an array,usually 0 or 1.
5. a list containing several items in which each item in the list points to the next item in the list.
9. a list containing several items operating on the first in, first out (FIFO) principle.
10. a list containing several items operating on the last in, first out (LIFO) principle.
12. a data structure containing several elements of the same data type.