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CSS (Cascading Style Sheets) and SASS (Syntactically Awesome Style Sheets) are both used to define the styles and layout of web pages, but they have differences in terms of syntax and functionality.

CSS (Cascading Style Sheets):

  1. Syntax: CSS uses a straightforward syntax to define styles for web elements. It consists of selectors, properties, and values.
  2. File Extension: CSS files have a .css extension.
  3. Variables: CSS does not have built-in variables. You need to repeat values manually if you want consistency across your styles.
  4. Nesting: CSS does not support nesting of selectors, which can make the code less organized and harder to maintain.
  5. Modularity: CSS does not inherently support modularization or the ability to break down styles into smaller, reusable components.
  6. Functions: CSS has limited built-in functions for calculations and transformations.
  7. Importing: CSS allows importing other CSS files using the @import rule, but it can lead to performance issues.

SASS (Syntactically Awesome Style Sheets):

  1. Syntax: SASS extends the syntax of CSS by introducing features like variables, nesting, mixins, and more, making the code more organized and easier to maintain.
  2. File Extension: SASS files have a .sass or .scss extension.
  3. Variables: SASS allows you to define variables to store and reuse values, promoting consistency and reducing repetition.
  4. Nesting: SASS supports nesting of selectors, which improves readability and keeps related styles together.
  5. Modularity: SASS enables the creation of modular stylesheets by using partials and importing them into a main SASS file.
  6. Mixins: SASS provides mixins, which are reusable blocks of code that can include properties and values, allowing for efficient code reuse.
  7. Functions: SASS supports the creation and use of custom functions for more advanced calculations and transformations.
  8. Importing: SASS supports importing other SASS or SCSS files, which can be beneficial for managing a project's stylesheets more effectively.
  9. Compile: SASS files need to be compiled into regular CSS before they can be used in web browsers. There are various tools available to automate this compilation process.

In summary, SASS is an extension of CSS that adds powerful features to the stylesheet language, making it more flexible, maintainable, and efficient for styling web pages. It provides tools like variables, nesting, mixins, and functions that enhance the developer's ability to write and manage styles.