lowercase filter is used to convert the input to all lowercase.
In below example, we've added lowercase filter to an expression using pipe character. Here we've added lowercase filter to print student name in all lowercase letters.
<div>
The name of this Tutorial is {{TutorialName}}
The first Topic is {{appList[0] | lowercase}}
The second Topic is {{appList[1] | lowercase}}
The third Topic is {{appList[2]| lowercase}}
</div>