Jisho

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Particle
1. topic marker particlepronounced わ in modern Japanese
  • ニューヨーク
  • ばん
  • まち
  • ぎんざ銀座
  • ひかく比較
  • される
  • New York's Fifth Avenue is comparable to Ginza.
2. indicates contrast with another option (stated or unstated)
    フーッ、
  • この
  • さかみち坂道
  • きつい
  • でも
  • かえ帰り
  • らく
  • Whew! This is a tough hill. But coming back sure will be a breeze.
3. adds emphasis
  • きみ
  • あした明日
  • おわかお別れ
  • I'm leaving you tomorrow.
Wikipedia definition
4. Ha (kana)は, in hiragana, or ハ in katakana, is one of the Japanese kana, each of which represent one mora. Both represent [ha ha]. They are also used as a grammatical particle (including in the greeting konnichi wa) and serve as the topic marker of the sentence. は originates from 波 and ハ from 八. In the Sakhalin dialect of the Ainu language, the katakana ハ can be written as small ㇵ to represent a final h sound after an a sound (アㇵ ah).
Read “Ha (kana)” on English Wikipedia
Read “は” on Japanese Wikipedia
Read “Ha (kana)” on DBpedia

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