"What are you doing?" is a phrase used to ask what the interlocutor is currently doing. It can be used in various contexts, such as to inquire about someones current activity or to express surprise or disapproval about someones behavior. The phrase is commonly used in everyday conversation and can be answered in various ways depending on the context and the speakers intention. For example, if someone asks "What are you doing?" and the person being asked is taking a shower, they can simply answer "Im taking a shower". It is important to note that "What do you do?" is a different question that asks about someones occupation or job.