What is the difference between 'float data type' and 'double data type'?

Question

The range of Float Dataype is : -3.4E +38 to +3.4E +38
The range of double Datatype is : -1.7E+308 to 1.7E+308

What does this mean? Can anyone explain me this?

Answer 1

float is a single precision (32 bit) floating point data type, double is a double precision (64 bit) floating point data type.

More:
https://www.quora.com/What-are-the-differences-between-the-double-and-float-data-types

Answer 2

@ Hasty Rei : Thanks