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HTML CSS JAVASCRIPT SQL PYTHON JAVA PHP W3.CSS C C++ C HOW TO BOOTSTRAP REACT MYSQL JQUERY EXCEL XML DJANGO NUMPY PANDAS NODEJS DSA TYPESCRIPT ANGULAR ANGULARJS GIT POSTGRESQL MONGODB ASP AI R GO KOTLIN SWIFT SASS VUE GEN AI SCIPY AWS CYBERSECURITY DATA SCIENCE INTRO TO PROGRAMMING INTRO TO HTML & CSS BASH RUST TOOLS ) The World Wide Web is about communication between web clients and web servers . Clients are often browsers (Chrome, Edge, Safari), but they can be any type of program or device. 1. The browser requests an HTML page. The server returns an HTML file. 2. The browser requests a style sheet. The server returns a CSS file. 3. The browser requests an JPG image. The server returns a JPG file. 4. The browser requests JavaScript code. The server returns a JS file 5. The browser requests data. The server returns data (in XML or JSON). XHR is often used to request and receive data for the purpose of modifying a web page. Despite the XML and Http in the name, XHR is used with other protocols than HTTP, and the data can be of many different types like HTML , CSS , XML , JSON , and plain text.