The answer to this is font-family. Example of usage: ``` <em>#headerFont{</em> <em> font-family: Times New Roman;</em> <em>} </em> ``` You can put your font name in quotes <em>(eg: "Ariel")</em> but it's not always necessary- but it is a good practice to get into because it helps to avoid certain fonts not being able to show up. Please note there are some fonts that will not work in certain browsers.
If you choose a custom font ether you made or you downloaded, unless you have the font itself saved into your code, unless the user has that font on their end, they will <em>not</em> see it- this is where backup fonts are helpful until or using universal ones; at least until you learn how to integrate the font fully into your website.
A document file format is a text or binary file format for storing documents on a storage media, especially for use by computers. There currently exist a multitude of incompatible document file formats.
