A parent-child scenario will help us understand what precision means.
The child asks, “May I have some money?” The parent grants the request and gives the child five dollars.
“That’s not enough! I need more than that!”
The parent asks, “Well, you didn’t say what you wanted it for or how much you wanted. You just asked for money.”
“Well, I need enough money to catch a movie with my friends and buy a combo for the movie.”
“Oh, so what you really need is twenty dollars. Here’s twenty dollars.”