What is the difference between the Boolean & operator and the && operator

If an expression involving the Boolean & operator is evaluated, both operands areevaluated. Then the &operator is applied to the operand. When an expression involving the && operator isevaluated, the firstoperand is evaluated. If the first operand returns a value of true then the second operandis evaluated. The&& operator is then applied to the first and second operands. If the first operandevaluates to false, theevaluation of the second operand is skipped.