Hiragana (ひらがな) is one of the Japanese wrting system along with Katakana and Kanji. As well as Katakana, Hiragana is phonetical and is a simplified form of Kanji.
Hiragana was inventied in the 9th century, in Heian period and is used for Japanese origen words, prepositions or as ruby characters.
When Japanese children start learning reading and writing, start with Hiragana.
More about Japanese language