TypeScript is a Superset of JavaScript. This means all valid JavaScript code is valid TypeScript code, but TypeScript adds powerful new features, especially Static Typing.
JavaScript vs TypeScript
JavaScript is a dynamically typed language. You can assign a number to a variable that previously held text without errors during coding, but this often leads to "crashes" when the web is already running. TypeScript prevents this by checking the data type when you write the code (compile-time error checking).
Key Features
Why use TypeScript?
Almost all modern professional projects (like React, Next.js, and Node.js backends) use TypeScript because of its ease in team collaboration and long-term code maintenance.