In physics and engineering, a **phase vector**, or **phasor**, is a representation of a sinusoidal function whose amplitude (**A**), frequency (**ω**), and phase (**θ**) are time-invariant. It is a subset of a more general concept called analytic representation. Phasors separate the dependencies on **A**, **ω**, and **θ** into three independent factors. This can be particularly useful because the frequency factor (which includes the time-dependence of the sinusoid) is often common to all the components of a linear combination of sinusoids. In those situations, phasors allow this common feature to be factored out, leaving just the **A** and **θ** features. The result is that trigonometry reduces to algebra, and linear differential equations become algebraic ones. The term *phasor* therefore often refers to just those two factors. In older texts, a **phasor** is also referred to as a **sinor**.

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