Hotlinking refers to the practice of third-party web properties loading resources (most commonly images) directly from your own server.
For example, if you operate the website yourbusiness.example, you may have an image at https://yourbusiness.example/infographic.png that you use within your website. A hotlink is when an unrelated property (for example, the site anotherbusiness.test) embeds that image directly on their website by reference to your server, for example using the following HTML code: