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When we talk about background images, @import, and more, we use the url() function to load a resource:

div {
  background-image: url(test.png);
}

In this case I used a relative URL, which searches the file in the folder where the CSS file is defined.

I could go one level back

div {
  background-image: url(../test.png);
}

or go into a folder

div {
  background-image: url(subfolder/test.png);
}

Or I could load a file starting from the root of the domain where the CSS is hosted:

div {
  background-image: url(/test.png);
}

Or I could use an absolute URL to load an external resource:

div {
  background-image: url(https://mysite.com/test.png);
}

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