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Program: A set of special instructions to tell the computer what tasks to perform. Computer Language: The rules for a valid format and combinations of instructions (sometimes referred to as syntax). Statement: In a computer language a group of words, numbers, and operators that perform a specific task: a = b * 2;    a and b - variables: symbolic placeholders for values.    2 - literal value - because it stands alone without being stored in a variable.    = and * - operators - they perform actions with values and variables such as assignments and mathematic multiplications. Expressions: Statements are made up of one or more expressions. An expression is any reference to a variable or value, or a set of variables and values combined with operators.