Do you see a different Google logo on Google search homepage instead of usual Google logo? Google logo keeps changing after every few days (specially on important days of festival occasion). So, why does Google change logo and not keep it same all the time?
Google logo change in honor of holidays
Google only change logo on holidays celebrated by people around the world. For example, expect to see a different logo on Valentine Day, Christmas, New Year, Thanksgiving.
New and different Google logo remains on Google homepage for 24hours and then changes back to default Google logo. At doodle gallery you can check the collection of different logos (also called doodles) that Google has used over the years.