What is considered retro?

What exactly is meant by the term "retro" when it comes to fashion, design, or culture? Is it simply referring to something that is old-fashioned or outdated? Or does it have a deeper meaning, encompassing nostalgia and a certain aesthetic that evokes a bygone era? What are some common elements that make something qualify as retro? How does the concept of retro evolve over time, and what are some current examples of its influence in today's society? Additionally, how does the idea of retro differ from vintage or antique, and why do people often find themselves drawn to these styles?