Hello, Can somebody help me understand the difference between these? Are some more popular in certain country/countries than others? Are all of them informal? All of my coursebook only had "qué tal" or "Cómo estás", and for many years I was sure that's the only way to say "how are you?" And now I've started seeing these other expressions on the Internet and I'm a bit confused. I understand the meaning but why do some people use this or that expression? Does it depend on the country? Thanks in advance! Ania