What's business flows when End Customer name and End Customer Address1 ,End Customer Address2 used i

Hi

 There are columns in address Tab at line level in sales Order” End Customer name and End Customer Address1…” what‘s business behind it.

  Not able to get any info in user guide and Oracle meta link and checked code too, they are pointing Hz_parties, hz_cust_accounts tables which is nothing but Normal customer tables.

if  we are selling through distributors, dealers, resellers to end customer as defined in Customer Master  and how invoice and takes place and process flows

or End customer will act like Deliver To ??

Please share if you have any process flow or documents for using end customers fields.