Cascading Style Sheet (CSS)
Defines how HTML elements such as layout, colors, & fonts will be displayed. External style sheets can be stored in CSS files, which allows for faster loading pages, smaller file sizes, and other benefits for visitors, search engines, and designers. The advent of CSS has a huge impact in the way modern websites look, with Javascript bolstering this modernization. However, improper use of CSS and Javascript can lead to slow loading speed, improperly rendered pages, and user-unfriendly experiences, all of which are detrimental to SEO efforts.