Slang is informal, playful language that specific groups of people use instead of standard words. Kids might say something is “fire” when they mean it's really good, or call their friends “squad.” Slang gives groups their own special vocabulary that feels current and insider.

Slang changes constantly. Words that seemed cool five years ago might sound outdated today. Your grandparents probably used slang their parents didn't understand, just like you use words that might puzzle adults now. Some slang eventually becomes so common it enters regular dictionaries: words like “cool” and “okay” started as slang.

Different groups develop their own slang. Skateboarders have terms like “shredding” and “gnarly.” Gamers say “gg” (good game) and “nerf” (to weaken). Regional slang varies too: people in different parts of the country might use completely different casual words for the same thing.

Slang serves important purposes. It helps people feel connected to their group and makes language feel fresh and fun. But there's a time and place for it. Writing a school essay or talking to your principal calls for standard English, while hanging out with friends is perfect for whatever slang your group uses. Understanding when to switch between formal language and slang shows skill with words.