Ad copy and keywords need to match each other closely. When someone searches for something and sees your ad, the words in your ad should reflect what they searched for. If they searched for "affordable website design" and your ad talks about something else entirely, they will not click. Google also rewards this match with a better quality score, which is a rating Google gives your ads based on how relevant they are. A higher quality score means you can pay less per click and still rank well. How often do you update your ad copy to match changes in keyword performance?