A favicon is a tiny icon that appears in the browser tab next to your website's title. It may seem like a small detail, but it can have a significant impact on your brand's visibility and recognition, as it serves as a visual representation of your website.
Also, a favicon improves user experience by making it easier for visitors to identify and switch between multiple tabs.
How to Add a Favicon
In Shopify admin, under Online Store, click on Themes.
Click on Customize.
Click on the Theme Settings icon.
Click on Favicon.
Click on Select Image.
Select an Image or add an image and click done.
Click Save to apply the changes.