What were you up to 13 years ago? Maybe you were perfecting the ideal AIM screen name. Or you might have been surfing the "WestHollywood" neighborhood of GeoCities. Chances are, you had been using Yahoo! or AOL as your primary search engines. But Google's debut on this day in 1998 would change the World Wide Web forever.

On Sept. 4, 1998, Larry Page and Sergey Brin filed for incorporation as Google Inc. — they had received a $100,000 check from an investor made out to Google, Inc., and needed to incorporate that name so they could legally deposit the check. However, in recent years, Sept. 27 is the day the celebratory Google Doodle appears.

Prior to the launch, Page and Brin met at Stanford in 1995, and soon decided to launch a search service called BackRub in January 1996. They soon reevaluated the name (and the creepy logo) in favor of Google, a play on the mathematical figure, "googol," which represents the number 1 followed by 100 zeroes. The name embodied their mission to create an infinite amount of web resources. And that they did.

Since then, Google has become a household name to billions of people worldwide. You'll overhear senior citizens command their grandchildren to "google" the price of foot cream. You'll witness toddlers punching the screen of the latest Android phone. And chances are, you've navigated the circles of Google+ (if not, let's get you an invite already).

We'd like to guide you on a trip down Google lane, presenting the key products and acquisitions that were born in the first Google garage office, and innovated in the Googleplex. In the comments below, please share how Google has had an impact on your life, and join us in wishing Google a happy birthday!