According to Wikipedia, as of February 6th 2023, the most liked video on Youtube is Despacito with 50.81 million likes.  

It is likely the most liked video for a combination of reasons: in part because it is the second-most viewed video of all time (behind only the "Baby Shark Dance")  I can speculate that it likely has more likes than "Baby Shark Dance" because it appeals to an older audience who are more likely to interact with the video.  As a Spanish-language song which shot to popularity in America (in part because of a Justin Bieber remix), it has enormous global reach.  Some other reasons include:


1. Catchy tune: "Despacito" features a catchy and upbeat tune that is easy to dance and sing along to. The song is a blend of Latin pop and reggaeton, which is a popular music genre in Latin America.
2. Collaborative effort: The song is a collaborative effort between two popular Latin American artists, Luis Fonsi and Daddy Yankee. Both artists have a strong following in the Spanish-speaking world, which helped to generate interest and excitement for the song.
3. Global appeal: "Despacito" is sung mostly in Spanish, but its catchy melody and upbeat rhythm have made it appealing to audiences around the world. In fact, the song's popularity led to an English-language remix featuring Justin Bieber, which further increased its reach.
4. Marketing: The song was marketed heavily on social media platforms like YouTube and Instagram, with a number of celebrities sharing videos of themselves dancing to the song. This helped to generate buzz and drive up the song's views and likes.
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