The Doctor of Moto GP.

Italian former professional motorcycle road racer and nine-time Grand Prix motorcycle racing World Champion Valentino Rossi was born on February 16, 1979. With both Honda and Yamaha, he won world championships in the top class. 

With nine Grand Prix World Championships under his belt, seven of which were in the elite 500cc/MotoGP class, he is regarded as one of the greatest motorcycle racers of all time and goes by the moniker "The Doctor." In addition, he rode with the number 46 for the duration of his career and is the first road racer to have participated in 400 or more Grands Prix.

Rossi won the final 500cc World Championship (being the last rider to win the top-class title to date) after moving up to the premier class in 2000. In addition, he won the MotoGP World Championships in 2002 and 2003 while competing for the factory Honda Team. After leaving Honda to join Yamaha, he continued to win consecutive championships in 2004 and 2005. His crash in Valencia's championship round cost him the title for that year. He ultimately came in third place in 2007, then won it back in 2008 and kept it in 2009.

Rossi rejoined Yamaha in 2013 and placed fourth overall. He then won three consecutive runner-up finishes in 2014, 2015, and 2016. In 2015, when he finished fifth overall and five points behind eventual champion Jorge Lorenzo, he had the best chance to win a tenth championship. In 2017, his final season in which he scored more than 200 points in the standings, he won his last race in the Dutch TT at the age of 38.

The super Bike that Rossi rode in 2004 was Yamaha YZR-M1. The press criticised Valentino Rossi for "biting off more than he could chew" when he agreed to a two-year deal with Yamaha that was reputedly worth more than US$6 million per season. Many of his admirers believed that even he would not be able to raise the struggling YZR-M1 to the level of the previously all-conquering Honda RC211V, in addition to his detractors and media pundits. 

The idea that a Honda RC211V in the hands of riders of the calibre of Max Biaggi and Sete Gibernau would have little trouble retaining the World Title for Honda was fueled by a well-publicized rise in the pace of development of the Honda machine throughout the winter season.

The majority of Rossi's long-standing crew, including Jeremy Burgess, were persuaded by Rossi to join him at Yamaha, thus Honda had to deal with more defections than just Rossi. This was a smart move, and Rossi acknowledged it in his memoirs as having been crucial to giving him the solid foundation he needed to use the YZR-M1 to target the Championship.

Following the Brno race on August 15, 2010, Rossi announced he will join Nicky Hayden and the Ducati team, signing a two-year contract that would begin in 2011.  On November 9, 2010, he rode the Desmosedici for the first time in Valencia, marking his first outing on an Italian motorbike since 1999. In order to be prepared for preseason testing in Malaysia, Rossi underwent surgery on the shoulder he hurt during the 2010 season. 

After making some headway in the first test, the Ducati underperformed in the second Malaysian test, leaving Rossi dissatisfied after finishing more than 1.8 seconds behind Casey Stoner's pace-setting Honda.

Rossi's departure from the factory Ducati squad at the conclusion of the 2012 season was officially announced on August 10th. Later that day, it was also revealed that Rossi would reunite with Jorge Lorenzo at the Yamaha factory team for the remainder of the 2014 season.  At a post-season test in Valencia on November 13–14, 2012, Rossi got back in touch with the Yamaha. 

But until he tested the 2013 machine later, on the 5-7 February 2013, at Sepang, rain prevented him from recording an exact lap time. There, he recorded the third-fastest time of 2:00.542 seconds out of 28 riders. He was only 0.113 seconds behind than teammate Jorge Lorenzo and 0.442 seconds slower than pacesetter Dani Pedrosa.

He made the announcement that he would leave MotoGP after the 2021 season on August 5, 2021, during the pre-event press conference of the 2021 Styrian motorcycle Grand Prix weekend. The career era of Valentino Rossi in MotoGP would come to an end then. 

His final race was the 2021 Valencian Community motorcycle Grand Prix, where he received congratulations for a good career from a number of celebrities and notable racers, including Casey Stoner, Lewis Hamilton, and Max Verstappen. At the Italian motorcycle Grand Prix in 2022, Rossi's number 46 was retired during a ceremony.