What is meant by double

Answer 1

It is number with double precision(float * 2)
Because of computers nature they can't store values with 100% precision so double just increase it

Answer 2

when you declare a variable the computer needs to know how much memory it can assign to it. Double, Tuple and other forms just tell the computer to use only a certain amount based on how big the (typically) number will be.

Answer 3

Double is used to classify a variable which is other than a whole number, sort of a fraction (or decimal)

Please note: This answer was given as is, based on my own understanding and knowledge of the question given and is subject to change and/or correction.

Answer 4

if you use float only can 65532 size use but in double u can increase of float size