BEM Methodology in CSS: predictable naming for clean styles

BEM methodology in CSS provides a predictable naming pattern for clean styles, preventing style collisions and making debugging easier. It's suitable for medium to large projects with many shared components and multi-person teams. BEM consists of Block, Element, and Modifier, with class names reflecting their role and state. It encourages repeatable, stable UI patterns and scales well for large codebases. To implement BEM, choose meaningful block names and use modifiers to change state, not structure.