: This is a unique identification number (ID) WordPress assigns to every image in its Media Library. It helps the system keep track of which specific file to display. Why This Matters for Your Site

If you are seeing this code instead of an actual image on your site, it often means there is a "path" error or a CSS conflict where the site can't find the original file or doesn't know how to style it.

: This is a performance feature called lazy loading . Instead of loading every image the moment someone opens your page, the browser waits until the reader actually scrolls down to where the image is. This makes the initial page load much faster.

: This tells WordPress how to position the image. In this case, "alignleft" ensures the image sits on the left side of the page with the text wrapping around it.

Browser-level image lazy loading for the web | Articles - web.dev

Using this standard WordPress format is a "win-win" for your website's health: