Logical or Boolean value: true/false
Used in if/while conditions () 
Conditional operators:
&&  AND
e.g. (x >= 0 && x <= 10)

A   B   (A && B)
T   T      T
T   F      F
F   T      F
F   F      F

||  OR
e.g ( x < 0 || x > 10)
A   B   (A || B)
T   T       T
T   F       T
F   T       T
F   F       F

!  NOT
e.g. !(answer == "A")

A    !A
T     F
F     T



Functions:
Calling the function 
   (use it in the program)
   
e.g. 
answer = prompt("What is your name?");