what are data-types?

Answer 1

number,string and boolean,
number is 1,2,3,....
string is any words, phrases or sentences with " ", example: "Ali"
boolean is true or false

Answer 2

data types are
char
var
float
boolean
double
sign
int

etc...,

Answer 3

here is a good ref link http://www.javatpoint.com/javascript-data-types

Answer 4

Just string, number and boolean

Answer 5

when talking about data types , we simply refer to the classes or varieties of values that are used and accepted in programming