Transformations are the bread and butter of Dragon Ball. Dragon Ball Z specifically is known for its many different transformations over the years, giving rise to the well-known Super Saiyan forms that Vegeta himself pointed out. While the Dragon Ball series is not the only anime to feature transformations, it is definitely one that codified the trope for future series to pick from. There are a lot of variations to choose from for fans of the series, and there is always a moment of genuine hype when a beloved character manages to unlock a new form. The first time Goku became a Super Saiyan lives in the minds of many anime fans as a formative experience. Even people who aren't familiar with anime have some knowledge of the legendary Super Saiyan.
Source：https://www.cbr.com/why-vegeta-had-trouble-reaching-ssj3/
