The following article was sourced from a Wikipedia page at the following address: http://en.wikipedia.org/wiki/Clip-on_tie
The clip-on tie is a bow tie or four-in-hand tie which is permanently tied, with a dimple just below the knot, and which is fixed to the front of the shirt collar by any of various sorts of clips, most commonly a metal clip. Alternately, especially in the case of bow ties, the tie may have a band around the neck fastened with a hook and eye.
REASONS FOR USE
The following are some reasons that this style of tie may be used:
People in white collar occupations are often mocked for wearing a clip-on tie in lieu of a standard necktie, the implication being that refusal to learn how to tie a "proper" tie reflects a wider lack of sophistication. Pre-tied bow ties are especially disliked in formal circles; according to one writer, "The quirky irregularities of a self-tied bow give it personality and flair... while the cookie-cutter precision of a pre-tied model diminishes it to an assembly-line commodity." Because child-sized ties are often clip-ons, some consider clip-ons juvenile. Finally, clip-on ties are generally available in limited styles, sizes, and prints relative to their conventional counterparts.
To read more about clip on ties, please click on the following link: http://en.wikipedia.org/wiki/Clip-on_tie