The viewport refers to the visible area of a website on a device such as a desktop computer, tablet or smartphone. It determines how much space the website takes up on the screen and how the user can see the content of the website.

The viewport can usually be influenced by the size of the screen, the resolution and the density of the screen. For mobile devices, the viewport can also be influenced by the orientation of the device (landscape or portrait mode).

In web design, it is important to set the viewport correctly to ensure that the website is clearly visible on different devices. This includes setting the width of the website to ensure that it is displayed on smaller screens, as well as setting the zoom level and font size.

To ensure that the website is displayed correctly on different devices, the viewport meta tag option can be used in the HTML code. This allows the web designer to adjust the viewport to the screen size of the device and ensure that the website is displayed optimally on all devices.

Overall, the viewport is an important aspect of web design that can help to ensure that websites are displayed optimally on different devices and screen sizes. By setting the viewport correctly, a good user experience can be guaranteed on all devices.