It's a possessive pronoun, similar to "my" in English. It's used to indicate something belongs to the speaker.
Here are some examples:
* 我的书 (wǒ de shū) - My book
* 我的朋友 (wǒ de péngyou) - My friend
* 我的家 (wǒ de jiā) - My home
It's important to note that "wo de" is often contracted in spoken Chinese, especially in informal settings. For example:
* 我的书 (wǒ de shū) might be shortened to 我的 (wǒ de) or even just 我 (wǒ) depending on the context.