Adding prefix into text means adding some words or something else before the text in every single line, for example:
We have source text:
123
456
789
If I add prefix "$", it becomes:
$123
$456
$789
Adding suffix into text means adding some words or something else after the text in every single line, for example:
We have source text:
123
456
789
If I add suffix "dollars", it becomes:
123dollars
456dollars
789dollars