What is a Keyword?
A keyword is a word related to the product or service on which the ad is put by the advertiser. Suppose if you want to give an ad about a hotel then the relevant keywords would be - food, drink, and dinner.
Why Keywords?
If you include keywords in your keyword list, your ad will be attached to an SMS if it contains any of those keywords. This helps in targeting the mobile users according to the context of the ad.
How does 160by2 know where to show my keyword-targeted ads?
160/2 has a mechanism by which it reads the SMS content, searches for the keywords you opted, and adds your ad to the SMS that have your keywords.