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Application Programming Interface (or API)
An API, or application programming interface, is a set of rules that determines how programs can interact with one another. These rules allow programmers to design their programs to work together for a cohesive experience.
Cascading Style Sheets (CSS) give coders aesthetic control over their web creations. When you know how to work with CSS, you can exercise your creativity with front-end elements such as fonts, color, and layout.
Hypertext Markup Language (HTML) forms the backbone of the web. Every page you see online owes its structure and content to this code. When building out the front end of websites and applications, you’ll often start with HTML to outline where various content on your page lives.
An essential consideration in a mobile-powered world, responsive design ensures that the layout and dimensions of websites and applications adjust to the screen size on which they’re viewed — desktop, smartphone, tablet, or otherwise.