A few days ago, I opened the Google homepage to find that Google's logo had been replaced with a picture of the cookie monster from the children's TV show Sesame Street. Intrigued, I clicked the logo and was taken to a page which explained that Google was celebrating 40 years of Sesame Street. But what are they actually doing?

Well, they're giving you a reason to visit their website, not just once but again in future. They're providing you with a reason to return to Google rather than the competition. They're adding value.