Why are there ridges beneath F and J on your keyboard and what are they called?

Best Answers:

1.) People who touch-type (type without looking) use these two ridges to determine the position of their fingers on the keyboard. Touch typists put the index finger of their left hand on F and the index finger of their right hand on J before they type so they know where their fingers are at.

2.) It's for people who touch-type (typing without looking at the keyboard) and they use the f and j keys so they know whereabouts their hands are!!! You will also notice it on the 5 key which is in the middle of the neumeric keypad at the far right of the keyboard.