Necktie knots shape the way a dress tie sits at the collar, and the two best known are the Windsor and the Half Windsor. The Windsor, sometimes called the Full Windsor or Double Windsor, ties a wide, symmetrical triangle that fills the spread of an open collar and carries an air of formality, which makes it a common choice for interviews, weddings, and other formal occasions. The Half Windsor is a little smaller and simpler to tie, a versatile everyday knot that sits well under medium-spread and point collars and suits the office or a semi-formal evening. Both pull up into a balanced, tidy knot, and both come undone by loosening the tie and drawing the narrow end back through. Choosing between them mostly comes down to the collar, the occasion, and how bold a knot the wearer wants at the throat.
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