| Dartz already gave you numbers, but...
I wouldn't call them an "alphabet." To sum it up, there are three "alphabets": hiragana, katakana, and kanji, and all are used by all people as part of the Japanese writing system. Hiragana and katakana (which is primarily used for scientific terms/foreign words/to place emphasis on a word) are similar to letters, but represent syllables, sounds.. they're combined to make certain words. All Japanese people know all hiragana and katakana, and you can in fact write without using kanji at all.
However, kanji makes things quicker to write and easier to read (especially since there are no spaces between words in Japanese). Kanji are symbols that represent certain words basically... for example, I'm sure you've heard the word "watashi." You could write this in hiragana (and some people do, but this also has to do with the style and tone you wish to write in, but I won't get into that now), with three symbols: wa-ta-shi, or a single kanji which is also read as "watashi." Same word.
There are around 80,000 kanji but the majority are obsolete. Most Japanese people know between 2000-3000 as Dartz said. That's also not individual kanji, but often combinations of other kanji which makes it more realistic. |