Oi! You should check your grammar before you ask the question. That question also makes literally no sense.
Answer:
Can you please add a picture or something?
Explanation:
Answer: The purpose of flashback is to either move the story forward or reveal information about the character. You can use flashbacks for any number of reasons but its primary purpose is to bridge time, place and action to reveal a past emotional event or physical conflict that affects the character.
Hope this helps!
The answer is the readers Senses. Because it helps us better imagine the settings as if we were there.