A necktie (or tie) is a long piece of cloth worn for decorative purposes around the neck or shoulders, resting under the shirt collar and knotted at the throat. Variants include the ascot tie, bow tie, bolo tie, zipper tie and the clip-on tie. The modern necktie, ascot, and bow tie are descended from the cravat. Neck ties are generally unsized, but may be available in a longer size. Men and boys wear neckties as part of regular office attire or formal wear. Neckties are traditionally worn with the top shirt button fastened, and the tie knot resting comfortably between the collar points. However, it has become common in recent times for neckties to be worn as a casual item, tied loosely around the neck, nearly always with one or several buttons unfastened.

and Now, I want to tell you about one method of tying a necktie. named "Four-in-hand knot"
The four-in-hand knot is a method of tying a necktie. Also known as a simple knot or schoolboy knot, the four-in-hand is believed to be the most popular method of tying ties due to its simplicity and style.
The four-in-hand knot is tied by placing the tie around the neck and crossing the broad end of the tie in front of the narrow end. The broad end is folded behind the narrow end and brought forward on the opposite side, passed across the front horizontally, folded behind the narrow end again, brought over the top of the knot from behind, tucked behind the horizontal pass, and the knot pulled snug. The knot is slid up the narrow end of the tie until snug against the collar. The four-in-hand knot is the prescribed manner of wear for officers of the United States Navy in full and service dress blue uniform.