Yes. The orange filter is a color-correction filter, commonly called a CTO (Color Temperature Orange) filter. Its purpose is to warm the flash output so it better matches warmer ambient light sources, such as tungsten/incandescent lighting, some warm CFL/LED bulbs, candlelight, or late-day sunlight.

A flash is normally close to daylight color. If you use unfiltered flash in a warm-lit scene, you can end up with mixed color temperatures: if you white-balance for the room light, the flash-lit areas may look too blue; if you white-balance for the flash, the ambient-lit areas may look too orange. Adding the orange filter makes the flash closer in color to the ambient light, so the whole scene is easier to balance naturally.

It can also be used creatively to give flash a warmer look, for example to support a golden-hour feel rather than a cooler, harsher flash look.