Variety in linguistics means different ways of speaking a language. You know how sometimes people from different parts of the world speak differently? That's because they have different varieties of the same language.
For example, in English, people from the United States and people from the United Kingdom speak differently. They use different words, pronunciations, and grammar rules. This means that American English and British English are varieties of the English language.
Sometimes, different varieties of a language can be so different that they become separate languages altogether. For example, Spanish and Portuguese were once very similar, but over time they evolved into separate languages because people in different countries started speaking them in different ways.
It's important to study and understand different varieties of languages because it helps us communicate better with people from different places and cultures. And who knows, maybe one day you'll learn a new variety of a language and be able to speak to even more people!