An important part of correct suturing technique is correct method in knot tying. The knots demonstrated here are those most frequently used by physicians. For clarity, one half of the strand is yellow and the other is white. The yellow strand is initially held in the left hand. Both knots demonstrated here are square knots which resist slipping of completed properly. Incorrect technique can result in a granny knot that easily slips when tension is applied. When the two ends of a suture are pulled in opposite directions with uniform rate and tension, the knot may be tied more securely.