If you are trying to use SVG like <img src="image.svg"> or as a CSS background-image, and the file is linked to correctly and everything seems right, but the browser isn’t displaying it, it might be because your server is serving it with an incorrect content-type.
Deprecated since SVG 2
This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Do not use it in old or new projects. Pages or Web apps using it may break at any time.