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Responsive web design is an approach to web design that makes web pages render well on a variety of devices and window or screen sizes. This is done by using flexible layouts, images, and cascading style sheet (CSS) media queries.
User experience (UX) design is the process of designing a website or application that is easy to use and provides a positive experience for the user. This involves understanding the user's needs, behaviors, and emotions and designing a product that meets those needs.
Web design refers to the visual and aesthetic aspects of a website, such as layout, color scheme, and typography. Web development, on the other hand, refers to the coding and programming that goes into creating a website and making it functional.