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Second-person plural pronoun used to address two or more people.
你们什么时候到？
When will you all arrive?
你们喜欢这个电影吗？
Do you all like this movie?
Used in both spoken and written Chinese. The singular form is 你 (nǐ).
Remember that Chinese often omits pronouns when the subject is clear from context. For example, '你们去吗？' (Are you all going?) can be shortened to '去吗？' if it's obvious you're talking to multiple people.
Use 你们 when addressing two or more people directly. For one person, use 你. There is no separate formal/informal plural form in Chinese.
The character 你 (nǐ) means 'you' in singular form, and the suffix 们 (men) is added to indicate plurality. The combination 你们 (nǐmen) has been used in Mandarin Chinese since at least the early 20th century.
Unlike English, Chinese does not distinguish between formal and informal plural 'you.' 你们 is used for both familiar and formal contexts when addressing multiple people.