15 years ago google.com was registered

In early 1996, Larry Page, a student at Stanford University, examining various topics for his dissertation, began working on the problem of assessing the value of web pages, analyzing the number and nature of links to them. Although this approach was, in fact, used for a long time in the usual citation of scientific works, most of the Internet search systems of that time carried out an assessment of the significance of a particular page based on how many times the search word was mentioned in it.

Soon, one of close friends of Larry, Stanford graduate student, Sergey Brin, who received a bachelor's degree in Mathematics and Computer Systems in Maryland and a US National Science Foundation scholarship, joined the Page project, codenamed “BackRub”.
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The search robot BackRub, launched on the university server, began indexing pages using the PageRank algorithm in March 1996. By the beginning of the next 1997, Larry Page described the statistics of his project as follows:

Some rough statistics (since August 29, 1996)
Total pages indexed: 75.2306 million
Total content downloaded: 207.022 gigabytes

BackRub is written in Java and Python and launched on Sun Ultra and Intel Pentium servers running on Linux. The main database is stored on the Sun Ultra II with a 28GB disk. Scott Hassan and Alan Steamberg provided a lot of talented help. Sergey Brin also took an active part and deserves great thanks.

September 15, 1997 was officially registered domain google.com. Less than a year later, Page and Brin, while still graduate students, received funding for the as-yet-not-based Google in the amount of $ 100,000 from Andy Bechtolsteym, co-founder of Sun Microsystems.

Officially, Google appeared on September 4, 1998.