Pointers

Answer 1

Pointers is an efficient way to access memory directly called as dynamic memory allocation

Pointer can create

Array
String
Functions
Structures
Files

Datasteuctures like

Stack
Queue
LinkedList
Tree
Graph

Answer 2

Be more descriptive with your question, if it is a question, and you expected answer(s).

https://www.sololearn.com/Discuss/333866/?ref=app

Answer 3

C lesson 19.1 Pointers
https://www.sololearn.com/learning/2933/