The QWERTY keyboard has been in use since PC-compatible computers were standardized in the late 1980s. The actual design behind the keyboard goes back even further --- to 1873, when Christopher Latham Sholes sought a layout in which successive keystrokes would alternate between the left and right sides of the keyboard so as to prevent typebar jams. Such concerns aren't relevant anymore, which means that QWERTY keyboards may have outlived their use.
Advantages
Although not a concern to many people, antique typewriters originally had the problem of jamming. This occurred when two letters that are close together were pressed in too quickly which caused them to bang together, usually jamming the machine. If the letters jammed too hard, it could even break the machine. This made original typewriters much less practical due to the amount of care that had to be taken to prevent letters from clashing. To prevent the issue, the QWERTY keyboard arranges the keys that were most commonly struck away from each other, preventing them from clashing and jamming.
The world over---at least in areas that speak the English language---QWERTY keyboards are the standard. Since their invention over 130 years ago, QWERTY keyboards have evolved. As typewriter technology advanced, so did the QWERTY keyboard. During the latter half of the 20th century as the advent of computers occurred, the spread of QWERTY keyboards once again occurred. Although the QWERTY method always dominated over any potential competitive inventions, its dominant use with the spread of computers---which almost every English speaking man, woman and child learns to type on in school---was sealed. Today, even many mobile devices utilize the QWERTY method.
Disadvantages
Disadvantages
The QWERTY keyboard was designed so that the most frequently used keys would be placed away from one another. While that proved useful for dealing with typewriters, many people argue that it's ineffective. In "The Dvorak Keyboard," Dr. August Dvorak claimed that typing common letter combinations requires making awkward and uncomfortable finger movements. In addition, most typing on a QWERTY keyboard is completed with the left hand, when in fact most people are right-handed.
The below one is the Dvorak Keyboard :
Dr. August Dvorak also argued that the QWERTY keyboard layout is inefficient. He claimed that 30 percent of QWERTY keyboard typing is performed on the lower rows, which are the hardest to reach. Furthermore, another 52 percent of typing is performed on the topmost row, which forces typists to move their fingers further away from the home row.
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