What katakana is
Katakana is the second kana script. A basic character normally writes one Japanese rhythm unit, called a mora, such as a, ka, or shi. Its core readings and chart order match hiragana, so you are learning new shapes and writing functions rather than a separate sound system.
The modern basic katakana set contains 46 characters. The open positions in the Y and W rows are part of the standard ordering, not missing page content.
