init _full repair

Hi

i have gone through lots link but still confuse

can any one explain what is differnce between  init delta and full load as i studied lots links where guru said init and full load both are simliar ans fetch whole data but set pointer first can any one explain what is the mean set pointer in init delta and how it can be similar as far as my understand it also type od delta which should be if compare similar to delta

please guru explain what excatly init role 

and one more doubt what is mean of full repair what it does '

  Repair full request in BI 7.0

  Difference: Full load, Delta Load & INIT lo... | SCN

above link i am follwoing to understand but still not getting clear picture

please help

thanks