Is a way of breaking up the page into boxes that can be moved and styled using CSS
<!DOCTYPE html> <html> <head> <title>My website</title> <meta charset="UTF-8"> </head> <body> <div> <section> <h2>Latest Deals</h2> <h3>See latest holiday deals here</h3> <article> <h4>Holiday 1</h4> <p>A lovely break in spain</p> </article> </section> </div> </body> </html>