when to normalize code example

Example: normalize

<script> 
var a = "Geeks For Geeks"; 
  
b = a.normalize('NFC') 
c = a.normalize('NFD') 
d = a.normalize('NFKC') 
e = a.normalize('NFKD') 
      
document.write(b,c,d,e); 
</script>