Some of the most common terms are:
Variable: A named location for storing values that can be changed during program execution.
Constant: A named location for storing values that cannot be changed during program execution.
Function: A named set of statements that perform some operation and can optionally return a single value.
Operator: Typically a symbol (such as +, -, *, or / ) that takes one or more values (called operands) and returns a result.
Expression: A combination of keywords, operators, variables, and/or functions from which a result can be calculated.
String: A sequence of 0 or more letters, numbers, or other text characters; strings are typically enclosed in quotation marks, as in “Hello World!”.
Boolean: A value or expression that evaluates to either true or false.
Literal: A Boolean, number or string that is written directly in the code. For example the expression 22/7*radius*radius contains 2 number literals.
Value: A number, Boolean, string or object.