How is YORKER bowled in cricket?

A yorker is a fullest possible length of delivery without becoming a full toss and depends on type of batsman and stride and speed and flight of the ball. As you can imagine, more flighted the ball and lesser the pace, the more easier is it for the batsman to make it a full toss. Other option is to go on back foot, get behind the ball and lower path distance of the bat. Constantly changing position of stance and stride can make a yorker a difficult ball to bowl, so should be bowled as a surprise element when batsman is not expecting it.