This is used for adding parameters. There are a few you can use but to be honest the one that is useful is: {KeyWord:default text} Use this in the advert and it will dynamically insert the keyword that gets triggered in the search, so your advert always looks relevant.
It's used for dynamic keyword insertion - so that your whichever version of your keyword is searched for, it's inserted into the ad. You can use it in any part of the ad. More here - http://adwords.google.com/support/aw/bin/answer.py?hl=en&answer=74996
Oh i forgot to say to change the 'default text' part to be whatever you would like it to be if the keyword that gets triggered takes the advert over it's character limit: adwords.google.com/support/aw/bin/answer.py?hl=en&answer=74996
Hi buddies, Thank you, this is a great help for me, I am new to this and this function is really really great. GCS
DKI = Dynamic Keyword Insertion. The directive inserts the keyword that triggers your ad in the ad itself.