A complex conjugate of a complex number is obtained by changing the sign of its imaginary part. If the complex number is $a + bi$, its complex conjugate is $a - bi$.
Imaginary Unit: $i$, defined as $\sqrt{-1}$, used to express imaginary numbers.
Modulus: The magnitude or absolute value of a complex number, given by $\sqrt{a^2 + b^2}$ for $z = a + bi$.
Real Part: The component $a$ in the complex number $a+bi$, representing its projection on the real axis.