Babel and SWC are both transpilers that convert modern JavaScript/TypeScript code into older versions for broader compatibility across different browsers. While both serve similar functions, SWC, written in Rust, is notably faster due to its efficient use of resources and threading capabilities. Babel, having been in the web development space longer, boasts a larger community but is slower than SWC, which is gaining popularity for its speed and ease of use thanks to clear documentation. Babel processes JavaScript code by converting it into an Abstract Syntax Tree (AST) and then modifying and generating code based on user-defined configurations. In contrast, SWC’s performance is enhanced through Rust's garbage collection, making it a preferred choice for companies seeking performance improvements, as demonstrated by Firefox and Tilde’s successful use cases. Despite these differences, both tools are essential for ensuring consistent JavaScript execution across varying browser environments, allowing developers to utilize new language features without compatibility concerns. The article also provides guidance on using SWC with Webpack and highlights the significant speed advantages of SWC over Babel, especially in multi-core async operations.