Jelly scripting knowledge is important to build custom pages and scripts, and also to amend Jelly code that exists in ServiceNow as part of the platform to work in a different way for your own purposes. We introduced Jelly scripting and how it can be used in a UI page in the last chapter. Let's remind ourselves what the Jelly tags ServiceNow gives us look like:

<?xml version="1.0" encoding="utf-8" ?>
<j:jelly trim="false" xmlns:j="jelly:core" xmlns:g="glide" xmlns:j2="null" xmlns:g2="null">

</j:jelly>

Once these tags are in place, we can start to include our Jelly code inside. This can be added to a UI page or UI macro. We will take a look at UI macros later in the chapter.