A speaker or writer uses you to refer to the person or people that they are talking or writing to. It is possible to use you before a noun to make it clear which group of people you are talking to.
When I saw you across the room I knew I'd met you before.
当看到你穿过房间时,我知道我以前曾见过你。
You two seem very different to me.
你们俩在我看来似乎很不同。
In spoken English and informal written English, you is sometimes used to refer to people in general.
Getting good results gives you confidence.
获得好的结果会给人以信心。
In those days you did what you were told.
那时候,你只能听命于人。