 In propositional logic, conjunction is the label for one of five logical connectives used to combine simple propositions into complex ones. The conjunction closely resembles AND in natural language and is alternatively symbolized by the ampersand symbol or by a turned V. It operates on the values of two propositions or conjuncts, for example P and Q, and produces a value of true if and only if both propositions or conjuncts are true. Here is an example. Earth is a planet and not a black hole. Assuming that both propositions are true, that is, the earth is a planet and it is not a black hole, we can thus assume that P and Q is true too. And if one of our propositions is false, well, the different truth values can be shown in a truth table. Here is the truth table for logical AND. We already know if both conjuncts are true, the conjunction is true. If P, however, is false and the earth is not a planet, the whole proposition earth is not a planet and not a black hole is false. Similarly, if Q is false and the earth is in fact a black hole, P and Q is false too. And if both propositions are false, that is, earth is not a planet and it is a black hole, well, then P and Q is false too. Thus, the truth value of a complex proposition linked with AND is determined by the truth values of its component propositions. It is true if and only if both conjuncts are true.