A tie clip, also known as a tie bar, tie clasp or tie slide, is an accessory used to fasten the tie to the front of a dress shirt and keep it from flapping.

The tie bar is a perfect menswear accessory that will add both style and function to your wardrobe. If worn correctly, it will add subtle, sophisticated elegance. A perfect menswear accessory accentuating the natural V of a man's body makes men look more masculine, less boyish, and in general more powerful. Never out of the style.

Your Quick Guide on Tie Clips
If you're wearing a skinny tie, you want to make sure you also have a skinny tie bar as well.
As with skinny ties, if you're wearing a wider tie - wear a wider tie clip.
With thicker ties, feel free to bulk up the tie clip material choice accordingly.
If your tie is patterned, stick with a simpler tie clip.
With a simple tie, opt for a simple clip for a chicer look.
Your tie clip should never overshoot the width of the tie.
When wearing a silver or gold tie bar make sure that the color matches other metals on your ensemble such as your belt buckle, watch, and cufflinks.