Filters are one part of Moodle that many Teachers don’t really use, even though they have control of them in their course Administration Block!
In simple terms, Filters ‘act upon’ content – transforming one item into another.
They can therefore be used to add links (that are active), insert multimedia players, and convert emoticons such as smiley faces 🙂 into images, and more.
Although Filters must first be enabled by the Moodle site administrator, they may then also be enabled or disabled as needed at the course or activity level by Teachers.
A simple example of use is that a Teacher can disable Glossary auto-linking in a Quiz for example – so that keywords do not link to a Glossary entry, and therefore providing a rather easy answer !