Cascading Style Sheets (CSS) serve many benefits in the web development process. These are used for webpage customization, content presentation and structuring, and also content portability. Let's know about the role of style sheets in website development:

1. Content Presentation and Structuring: CSS provides flexibility in deciding the mode of presentation and structuring of the content. It enables the webmaster to make changes to the content as per the current needs and requirements.
2. Web design Alterations: It provides flexibility to make changes to the design at any point without changing the content part. The alterations can be made to the design to make the layout fresh for the users as well as search engine crawlers.
3. Easy Customization: CSS enables easy option to customize web pages without changing the existing elements of the page.
4. Placement of Web Elements: The elements such as links and columns in a web page help to make the site technically strong. CSS allows to position the elements properly to avoid any maintenance issues at later stages.
5. Consistency: The consistency of web pages throughout the website is important so as to make alterations possible to the web page elements. CSS development makes this possible by bringing changes to the elements at any point during the development process.
6. HTML Support: The HTML support to style sheets is an add-on for the website to develop superior web pages that helps the web page to load faster and work efficiently. This is only possible if HTML and CSS are used together.
7. Fast Loading Time: The style sheet requires less space and bandwidth that helps to load the web page faster. The quick loading time of the page helps to perform better in the web world.
8. Browser Compatibility: The website reach is sometimes restricted because of the browser compatibility. The Style sheets ensure multiple browser compatibility to extend its reach beyond geographical regions.
9. Add Different Colors: CSS is used to have multiple colors on the web page, which will not be possible by using HTML as a standalone. Hence, it is vital to include CSS in the web development.
10. SEO Friendly: The sole purpose of a website is to reach the target market and search engines can make the task easy by placing your site on top of the results. Hence, CSS helps a website to become SEO friendly by positioning the content and web elements in a way to attract search engine crawlers.

 All the above points give a clear indication that the use of CSS has become an essential part in web development process. Therefore, while developing a new website, you must ensure that the web development company is using CSS along with HTML for a great website.