What does "What about you?" mean in English language?

Answer 1

Usually, it means "and you also?"
For example: I am going to the store, what about you?

It can also mean "what is your feelings or thoughts on this?"
For example: I do not like this, what about you?

Answer 2

Usually, someone will have given their own opinion/feeling about something, and then ask "What about you?" to find out the other person's.
I'd like to see this movie, what about you?

Answer 3

if i was to ask you a question like 'what do you think?', 'what's your name?', 'where do you came from?' or 'how are you today?', basically any question about yourself, you would answer, then out of politeness, you would say 'what about you?' which means 'now you answer the question you just asked me' it just saves you from repeating what they just said. very useful, some people just say 'you?'

ie me: 'what's your name?'
you: 'sally, what about you?'
me: 'jane, where do you come from?'
you: 'sweden, you?'
me: 'england'

you see?

Answer 4

It depends on the context but generally it would be asking for your input or opinion.

Answer 5

It means, "What do you think?"