What is Dictionary, queue and stack in C#?

Question

I don't really understand what are those. I know they are generic collections.
And what is FIFO and LIFO?

Answer 1

these are collection with special behavior:
FIFO (First In First Out):example stack
LIFO (Last In First Out):example linked list

Answer 2

FIFO = First In First Out
LIFO= Last In First Out

Dictionary is an array which has keys and values in basic.Let me explain :
Dictionary<string, int> d = new Dictionary<string, int>() {
{"cat", "meow"},
{"dog", "woof"},
{"lion", "graaw"},
{"fish", "blopblooop"}
};

instead of camping with index number
array [0]

you call by index

d["cat"]

Answer 3

@Highman
Yes i know what it stands for but i don't know how to use it
@Melih
thanks for explanation 😃