Scriptlets
From OpenCms Wiki
Scriptlets are just JSP files that are composed using regular Java code instead of taglib code. Note that one doesn't exclude the other, so you can even use a mix of the two.
Choosing between scriptlet code and taglib code is usually just a matter of preference.
A typical scriptlet starts by retrieving the CmsObject, which is often a central access point for many of OpenCms' features.