A EULA (stands for End User License Agreement) is a document outlining the usage terms and conditions on how you may use the fonts from each specific foundry.
You should assume that each of our foundry partners will have their own EULA, although some of the terms could be the same or very similar.
The EULA will explain different types or usage and what is and isn't allowed, sometimes with examples. It will also tell you how the maximum usage is determined for each license type - for example, a maximum number of users who have the font installed or the maximum page views per month that your website received.
If you are not sure on anything with regards to your usage then please ask us to check for you at email@example.com and we will be able to help.
For specific and detailed instructions and where and how you can use a font, please read the relevant Foundry Partner's EULA