小吃 (xiǎochī) is a noun meaning "snack" or "street food." It refers to small, often local or traditional dishes that are typically eaten casually rather than as a formal meal. For example, 中国的传统小吃 means "traditional Chinese snacks."
这条街上的小吃又便宜又好吃。
zhè tiáo jiē shàng de xiǎochī yòu piányi yòu hǎochī.
The street food on this street is both cheap and delicious.
你来北京一定要尝尝当地的小吃。
nǐ lái Běijīng yīdìng yào chángchang dāngdì de xiǎochī.
When you come to Beijing, you must try the local snacks.
我最喜欢的小吃是煎饼果子。
wǒ zuì xǐhuan de xiǎochī shì jiānbing guǒzi.
My favorite snack is jianbing guozi.