Retro is a term that describes a culturally outdated or old-fashioned style, trend or fashion from the past that has come into style once again. Usually, styles with a vintage of between 20 and 30 years are considered retro. The use of "retro" style iconography has been a common trend in web design for quite some time now, and the trend will likely continue in the future.
A retro design can add a dynamic, functional, cozy, fun and even modern feel to a website. All kinds of sites are sporting this trend, from online shops and corporate sites, to personal sites like portfolios and blogs. In all of these cases, designers use their creativity to make the design stand out from the rest.