Most of us hardly ever dress up, if at all. But when we do, we often wear some sort of neck tie, whether it's the standard type, or the bow tie. If you have done more than one of these, pick what you most prefer. A description for those who don't know:
Four-in-Hand Knot - The simplest knot to learn, requiring the fewest steps, leaving a smaller knot. Unlike the other knots listed, it lacks symmetry. A good choice for narrower collars.
Half Windsor Knot - Another rather simple knot, with one extra loop compared to the one above, resulting in a slightly larger knot, and symmetry. A great option for many situations.
Windsor Knot - The full Windsor has the most steps, making it the hardest to remember. The knot is larger than the others mentioned, so it stands out. Often used by famous people and those of high status. A good choice for wider collars.
Pratt Knot - The process starts differently from the three above (inside out instead of display side out to start with), and is the youngest of the group. The knot is larger than the Four-in-Hand, but smaller than the Windsor. For those who still want to wear the neck tie, but still be different in a minor sort of way.
Clip-On Ties - For those who want to wear a tie, but don't want to bother learning how to tie them. Just don't get caught with it falling off of your shirt.
Bow Ties - Some people think they are cool, especially from certain seasons of a well known British TV series. The standard for tuxedos, and those who want to stand out among the neck ties.
As for me, I have only used the first two: The Four-in-Hand, and the Half Windsor. I most prefer the Half Windsor, as despite there being an extra loop in the process, the symmetry makes me more satisfied with the look and thus less likely to try again.