When dressing for formal functions or business meetings; it's important you choose not only the right tie, but also the right knot.
There are many different knots, which each serve their own purpose. None of which make as sharp an impression as the windsor knot (after all it's named after the Duke of Windsor). The windsor knot is the knot of choice for all formal functions or business meetings.
Also known as a full windsor or double windsor, when completed correctly forms a perfectly shaped knot that suits almost any type of shirt collar. In particular this thicker knot sits especially well with wide-spaced collars, such as the spread collar or cutaway collar.