CSS Cascade Layers are an important tool in web design for managing complex styles across multiple stylesheets, helping to resolve conflicts and maintain consistent styling rules. The cascade process, which determines how styles are applied, consists of several key steps: relevance, importance, origin, layers, specificity, and order of appearance. CSS Cascade Layers allow developers to create structured hierarchies within styles, offering both named and anonymous layers to organize styles effectively. By utilizing @layer and @import rules, developers can create and manage these layers, ensuring that styles are applied in a specified order of precedence, which is crucial for maintaining modularity and preventing conflicts, especially in large codebases. Nested cascade layers provide additional organization and scope, enhancing reusability and modularity of styles. Understanding the precedence of layers based on their order, along with browser support considerations, empowers developers to build visually appealing and functional websites.