Answer 1

hexadecimal is another form of representing numbers just similar to binary and deximal systems.
in binary we have 0,1
decimal 0-9
hexadecimal 0-9 ,a-f
we have another octal 0-7

pointers are another data types just like int, char, strings,float,doubles.
like integer stores integer values, pointer stores memory address. generally memory address of another variable