This template is used on 10,000+ pages and changes may be widely noticed. Test changes in the template's /sandbox or /testcases subpages, or in your own user subpage. Consider discussing changes on the talk page before implementing them.
This template takes a template-name and an optional number of associated parameters (or 'pass parameters'), and aggregates them into an 'example demonstration' of how the template might be used. It's primary use is in instruction and documentation such as this passage.
Additionally, tlx can be used to demonstrate templates on other sister projects.