For more general information on cookies see the Wikipedia article on HTTP Cookies.
Session Cookies - Sometime we might need to remembering who you are. For example if you 'log in' to our website, we set a cookie for a short time to save you having to log in again.
Payment Processing - If we process any payments or donations you make our payment provider may insist we set a cookie in order to do so.
Development Tools - Occasionally we might temporarily use a tool on the website to test different version of the website and these tools require us to set a cookie.
Social Media - We may use code from the likes of Facebook or Twitter to add functionality to the website. These companies will set their own cookies.
Analytics - In order for us to monitor the usage of our website our analytics provide may need to set a cookie.
Hopefully that has clarified things for you and as was previously mentioned if there is something that you aren't sure whether you need or not it's usually safer to leave cookies enabled in case it does interact with one of the features you use on our site. However if you are still looking for more information then you can contact us through one of our preferred contact methods.
You can prevent the setting of cookies by adjusting the settings on your browser (see your browser Help for how to do this). Be aware that disabling cookies will affect the functionality of this and many other websites that you visit. Disabling cookies will usually result in also disabling certain functionality and features of the this site. Therefore it is recommended that you do not disable cookies.