Sometimes when you view your web site or web page on another computer you'll see that the fonts are not the same as the ones you see.
That is because some fonts are only installed on your computer. Fonts are sometimes installed by installing software like Adobe Photoshop. If someone doesn't have those fonts they will see a fall back font.
This may not be the desired behavior.
For someone else to see your fonts you can have them install the font, you can convert your text to an image or you can embed the font.
Once the font is embedded in your page your user will see the font once it is downloaded.