Please explain the script

[#1]

//Dynamic IntervalMatch mapping
 //Alexander Karlsson - Ze Demoz Teamz - 2013-09-24
 
 //Point to your excel file
 temp:
 LOAD DISTINCT FieldName
 FROM
 RiskData.xlsx
 (ooxml, embedded labels, table is [Bucket Templates]);
 
 LET noRows = NoOfRows('temp');
 
 for j=0 to $(noRows)-1
 let vFieldValue = peek('FieldName',$(j),'temp');
 let vFieldEncoded = '[$(vFieldValue)]';
 
 $(vFieldEncoded):
 LOAD FieldName, 
 StartRange, 
 EndRange, 
 Label as [$(vFieldValue) Bucket], 
 SortOrder as [$(vFieldValue) BucketSort]
 FROM
 RiskData.xlsx
 (ooxml, embedded labels, table is [Bucket Templates]) where FieldName = '$(vFieldValue)';
 
 IntervalMatch($(vFieldEncoded))
 Left Join ($(vFieldEncoded)) Load StartRange,EndRange Resident $(vFieldEncoded) where FieldName = '$(vFieldValue)';
 
 Next
 
 DROP TABLE temp;
 Drop Fields StartRange,EndRange,FieldName; 

Please explain the purpose of the script.Apologies.